4.3 | 2018-03-27
   - Added security enhancements.
   - Added GPL to plugin header.
   - Updated API library to public property in support of MailChimp block.
   - Updated Plugin URI and Author URI to use https.
   - Fixed the MailChimp API returning a validation error for list date fields set to the DD/MM/YYYY format.
   - Fixed existing member retaining a status of cleaned or transactional instead of changing to pending or subscribed.
   - Fixed birthday and date merge fields not being sent in the defined date format.
   - Fixed an issue with the member status on resubscription to the list.
   - Fixed PHP notice if the interests are not returned by the MailChimp API for the existing member.
   - Fixed issue with css file that was being enqueued in every page.


# 4.2 | 2017-04-03
   - Added additional logging when checking if a user's subscription status.
   - Added existing member object as sixth parameter of "gform_mailchimp_subscription" filter.
   - Fixed PHP warning when attempting to check for existing interests when member did not belong to any interest categories.
   - Fixed Fatal error that happened in certain situations.
   - Fixed existing interest categories not being properly associated to subscription object.
   - Fixed an issue with subscriptions not being created due to empty merge fields.
   - Fixed an issue which could prevent the feed groups being converted to interest categories when upgrading from older versions of the add-on.
   - Fixed inability to use double opt-in with existing memebers.
   - Fixed API response error handling; API key was incorrectly shown as valid when a 403 Forbidden error was returned.
   - Fixed an issue with the field value used for interest category logic evaluation.
   - Restored GFMailChimp::get_group_setting_key() for use when upgrading from older versions of MailChimp Add-On.
   - Restored double opt-in support for members who are being resubscribed to a list they are unsubscribed from.
   - Disabled double opt-in support for members who are being resubscribed to a list they are unsubscribed from. (Member will be automatically subscribed to the list. This is a temporary workaround for an issue with the MailChimp API.)
   - Re-introduced support for "gform_mailchimp_keep_existing_groups" filter.


# 4.1 | 2017-01-03
   - Added additional error logging when creating a subscription.
   - Added support for configuring a note to be added to the subscriber.
   - Fixed a fatal error during feed processing when a list field is mapped to an entry property.
   - Fixed an issue where an Invalid Resource error would occur if the subscribers merge_fields property was included in the request when empty.
   - Fixed an issue with the note being urlencoded during merge tag processing.
   - Fixed users not being subscribed due to incorrect address formatting.
   - Increased number of merge fields returned for a list.
   - Updated feed processing to bypass override empty fields check for address fields.
   - Updated maximum number of category interests returned by the API.
   - Updated maximum number of interest groups returned by API.
   - Updated merge fields field map to only allow Address fields to be mapped to MailChimp address merge fields.
   - Updated strings for translations.
   - Updated subscription object to use existing member status where possible.


# 4.0 | 2016-12-20
   - Added gform_mailchimp_subscription filter to modify subscription object.
   - Removed 3.0 upgrade page.
   - Removed send welcome email as feed settings option.
   - Updated API requests to use MailChimp API 3.0.


# 3.7.5 | 2016-11-29
   - Fixed strings for translations


# 3.7.4 | 2016-09-16
   - Fixed an issue with multi-input fields available for use with groups logic not including the inputs (i.e. Name and Address).


# 3.7.3 | 2016-05-06
   - Updated the MailChimp API to support the WP_PROXY_HOST and WP_PROXY_PORT constants when configuring the cURL options.


# 3.7.2 | 2016-03-11
   - Fixed an issue which was preventing feed processing aborting early if there is an issue with the MailChimp API.


# 3.7.1 | 2015-09-23
   - Fixed an issue where the cached settings were not cleared when the add-on was uninstalled.
   - Fixed a rare issue for some server environments where several groups could be assigned the same settings key causing js issues in the feed editor.
   - Fixed an issue where the cached group setting keys could be lost when updating the API key on the plugin settings tab.


# 3.7 | 2015-08-24
   - Added form and field specific versions of the gform_mailchimp_field_value filter.
   - Added logging of group condition evaluation.
   - Added $transaction, either Update or Subscribe, as the fifth parameter of the gform_mailchimp_args_pre_subscribe filter.
   - Updated minimum Gravity Forms version to 1.9.3.
   - Updated 'Opt-In Condition' setting label to 'Conditional Logic'.
   - Updated feed processing to use get_field_value() when retrieving mapped field values, enabling support for GF_Field::get_value_export with GF 1.9.12.4 and later.
   - Updated to use GF_Field::is_conditional_logic_supported to determine which field types should be listed in the group condition fields drop down.
   - Fixed an issue with the feed list page if the API key not valid.
   - Fixed an issue with the location of the gform_mailchimp_args_pre_subscribe filter.
   - Fixed an issue with the upgrade routine which caused it run even if a pre-framework version hadn't been installed.
   - Remove plugin settings header and add line break after plugin settings description.


# 3.6 | 2015-04-20
   - Added filter to allow changing parameters to the API method that returns the MailChimp Lists.
   - Added Spanish (es_ES) translation.
   - Fixed a low severity security vulnerability in the admin area which could be exploited by authenticated users with form administration permissions.
   - Fixed an issue with the members existing groups being lost if no new groups were selected and gform_mailchimp_keep_existing_groups is true.


# 3.5 | 2015-02-03
   - Updated required version of Gravity Forms to 1.8.17.
   - Fixed an issue with Address fields where MailChimp would ignore the passed string if it did not contain the street address, city, state, or zip.


# 3.4 | 2015-02-02
   - Added support for the middle name input when preparing Name field values.
   - Updated required version of Gravity Forms to 1.9.
   - Fixed an issue causing checkbox fields not to be mapped under certain conditions.
   - Fixed fatal error with PHP < 5.4.


# 3.3 | 2015-01-30
   - Updated logging statements.
   - Updated the gform_mailchimp_field_value filter to have an additional parameter which includes the name of the custom mapped field.
   - Fixed issue causing address not to be mapped properly under certain scenarios.
   - Fixed Notice.
   - Fixed an issue with the concatenated string for Checkbox fields not being cleared before the next field is processed.
   - Fixed a warning when MailChimp interest groups aren't enabled on the list.


# 3.2 | 2014-12-08
   - Added hook to allow args to be changed before sending submission to MailChimp.
        add_filter( 'gform_mailchimp_args_pre_subscribe', 'override_mailchimp_params', 10, 4 );
        function override_mailchimp_params( $params, $form, $entry, $feed ) {
            // do stuff

            return $params;
        }
   - Added hook to select whether empty mapped fields should override existing values on Mailchimp; defaults to override.
        add_filter('gform_mailchimp_override_empty_fields', '__return_false' );
   - Fixed issue where existing groups were not maintained for users already subscribed.
   - Fixed notice messages.
   - Fixed fatal error displayed on certain situations.


# 3.1 | 2014-11-21
   - Fixed issue where grouping assignment was not working for already subscribed users
   - Fixed issue where a fatal error is displayed in certain situations
   - Fixed issue with upgrade that caused configuration not to be copied over in certain situations


# 3.0 | 2014-11-04
   - Added integration with Add-On Framework
   - Added support for sending selected checkboxes as a concatenated string
   - Updated POT file
   - Updated required version of Gravity Forms to 1.8.17
   - Updated to MailChimp API version 2.0.
   - Updated files removing closing php tag at the end.
   - Fixed a warning when MailChimp interest groups aren't enabled on the list.


# 2.2 | 2013-06-19
   - Updated phone number when set to standard format "(###)### - ####" to send in required format of ###-###-####


# 2.1 | 2013-03-26
   - Added Name (Full) as an option to the field mapping list when the form has a Name field set to Normal or Extended format


# 2.0 | 2013-03-07
   - Fixed PHP warnings when no API key was set
   - Added the gform_mailchimp_field_value filter to enable the value to be modified before being sent to the MailChimp API.
   - Added entry meta to the list of available field mappings
   - Fixed issue with group conditional logic not displaying all possible operators and value drop down correctly
   - Fixed issue with special character in main group name
   - Fixed issue with group conditional logic with non-selection field types
   - Added new hook "gform_mailchimp_allow_resubscription" which allows disabling support for resubscription
        add_filter('gform_mailchimp_allow_resubscription', '__return_false()');
   - Fixed issue saving group settings in admin when sub groups have the same name


# 1.9 | 2012-11-28
   - Updated Group logic to keep existing groups.
   - Added filter to change logic back to overriding groups
        add_filter("gform_mailchimp_keep_existing_groups", "__return_false");
   - Updated to treat members as if they were a new subscribe request when currently set to a status on MailChimp's side of unsubscribed, pending, cleaned
   - Fixed issue with special characters in MailChimp Group names causing issues when creating feed.



# 1.8 | 2012-10-24
   - Fixed issue with GetFieldValues() when used with groups; was returning full select when only options were required
   - Fixed notices
   - Fixed group names (commas in names are treated by MailChimp as a delimiter indicating multiple groups)


# 1.7 | 2012-07-03
   - Fixed issue with some Mapped Fields not being passed (Entry Date, User IP, Source Url, Form Title)
   - Added new conditional logic options (greater than, less than, contains starts with, ends with) and support for other conditional fields
   - Fixed notices
   - Fixed issue when testing if email is already in the list


# 1.6.3 | 2012-03-13
   - Added logging
   - Fixed notices
   - Fixed issue with single quotes on feed edit screen creating javascript errors


# 1.6.2 | 2012-03-01
   - Fixed issue with sack script being initialized with an incorrect admin url.
   - Fixed issue that causing conflicts with feeds created by older versions of the plugin


# 1.6.1 | 2012-01-20
   - Fixed issue that caused warnings to be displayed on feeds created by older versions.


# 1.6 | 2012-01-05
   - Fixed issue where RG_CURRENT_PAGE constant was not available when GF is deactivated
   - Fixed noticed caused where $api variable not declared
   - Added support for MaiChimp Groups so that subscribers can be assigned to a group when added to a list.
   - Added Form Title to the list of fields to be mapped
   - Updated procedure that gets the MailChimp lists so that more than 25 lists are returned (up to 100).
   - Added integration with PayPal so that subscribers can be added only when payment is received


# 1.5 | 2011-06-23
   - Updated API Wrapper to 1.3 (mini)
   - Removed blank strings from POT file to prevent error messages in Poedit


# 1.4 | 2011-04-25
   - Cleaned up notices
   - Fixed issue when using Opt-in condition on a field with multiple single quote characters in the label
   - Fixed issue when creating a feed using forms with HTML markup in field labels


# 1.3.4
   - Cleaned up notices


# 1.3.3
   - Added "Cancel" button to Edit page and updated "Save" and "Update" button verbiage


# 1.3.2 | 2011-02-06
   - Fixed issue with MailChimp lists being displayed as blank values. Taking into account different data formats returned by the API


# 1.3.1 | 2010-12-15
   - Using new MailChimp PHP API wrapper (v. 1.2.6) when authenticating via an API Key


# 1.3 | 2010-12-15
   - Added support for authentication via MailChimp API Key


# 1.2 | 2010-12-15
   - Fixed issue with automatic upgrade on WP 3.0


# 1.1
   - Adding MailChimp capabilities to admin role upon plugin activation


# 1.0.beta-2
   - Added MailChimp icon
   - Renamed "Contact List" to "MailChimp List"


# 1.0.beta-1
   - Changed text on list page when settings haven't been configured
   - Created POT file


# 0.2 | 2010-12-15
   - Map Fields column headers to ?List Fields? and ?Form Fields? and bol
   - Rename button to "Save Feed" for a new feed and "Update Feed" for an existing one
   - Settings page subnavigation to look like "Edit Forms" subnav (i.e. All | Active | Inactive) with no pipe at the end
   - Try adding menu item between Entries and Settings
   - Move "Add Feed" to top right (like posts page) and rename to "Add new"


# 0.1 | 2010-12-15
   - Split logic from Feeds Add-On
   - Implemented automatic upgrade
   - Implemented list page checkboxes (for bulk actions)
   - Implemented active/inactive icons on list page