Updating the Mailchimp module to 7.x-5.2.

sites/all/libraries/mailchimp/CONTRIBUTING.md

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+# Contributing
+
+Thank you for taking the time to help us develop the MailChimp library!
+
+We do all our work on GitHub. If you'd like to help, you can create a
+[free GitHub account here](https://github.com/join).
+
+## Reporting an issue
+
+For bug reports or feature requests, please [create a new issue](https://github.com/thinkshout/mailchimp-api-php/issues).
+
+If reporting a bug, please:
+
+* Let us know what steps we can take to reproduce the bug
+* Include any error messages you received
+
+## Submitting changes
+
+The best way to submit a bug fix or improvement is through a [pull request](https://help.github.com/articles/creating-a-pull-request-from-a-fork/).
+
+* [Fork](https://guides.github.com/activities/forking/), then clone the repository:
+
+`git clone [email protected]:YOUR-GITHUB-USERNAME/mailchimp-api-php.git`
+
+* Install the library's dependencies using [Composer](https://getcomposer.org/):
+
+```shell
+cd mailchimp-api-php
+composer install
+```
+
+* If you are adding new functionality, please add a corresponding test.
+  See [Testing](#testing) for more information.
+
+* After making your changes, ensure all tests pass.
+
+* Commit and push your changes to your fork of the repository.
+
+* [Submit a pull request](https://github.com/thinkshout/mailchimp-api-php/pulls).
+
+## Testing
+
+This library includes a [PHPUnit](https://phpunit.de/) test suite. Keeping these
+tests up to date helps us ensure the library is reliable.
+
+### Running PHPUnit tests
+
+Add Composer's vendor directory to your PATH by adding the following line to
+your profile. This is dependent on your system, but on a Linux or Mac OSX system
+using Bash, you'll typically find the file at *~/.bash_profile*.
+
+`export PATH="./vendor/bin:$PATH"`
+
+Bash example:
+
+```shell
+echo 'export PATH="./vendor/bin:$PATH"' >> ~/.bash_profile
+source ~/.bash_profile
+```
+
+Then run PHPUnit:
+
+`phpunit`
+
+### Creating new tests
+
+Tests are located in the *tests* directory and are grouped into PHP files named
+after the library component they are testing. For example,
+*MailchimpCampaignsTest.php* contains tests for MailChimp Campaigns.
+
+New tests should contain at least the functionality in this simple test:
+
+```php
+public function testGetCampaigns() {
+  $mc = new MailchimpCampaigns();
+  $mc->getCampaigns();
+
+  $this->assertEquals('GET', $mc->getClient()->method);
+  $this->assertEquals($mc->getEndpoint() . '/campaigns', $mc->getClient()->uri);
+}
+```
+
+This test checks the request type and request URI are both correct.
+
+More advanced examples can be found in the *tests* directory.
+
+## Additional resources
+
+* [MailChimp API documentation](http://developer.mailchimp.com/documentation/mailchimp/)
+* [MailChimp Drupal module](https://www.drupal.org/project/mailchimp), MailChimp integration for Drupal using this library.
+* [MailChimp E-Commerce Drupal module](https://www.drupal.org/project/mailchimp_ecommerce), MailChimp integration for Drupal Commerce using this library.
+* [ThinkShout](https://thinkshout.com), the library maintainer.
+
+## Want to help build this and other open source projects?
+
+We're hiring software engineers! Check out our [careers page](https://thinkshout.com/careers/).

sites/all/libraries/mailchimp/README.md

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+# PHP library for v3 of the MailChimp API
+
+This library provides convenient wrapper functions for MailChimp's REST API.
+The API is [documented here](http://developer.mailchimp.com/documentation/mailchimp/guides/get-started-with-mailchimp-api-3/).
+
+## Requirements
+
+- PHP 5.4.0 or greater (7.0 or greater if you wish to use phpunit)
+- [Composer](https://getcomposer.org/)
+- [Guzzle](https://github.com/guzzle/guzzle)
+
+## Installation
+
+Dependencies are managed by [Composer](https://getcomposer.org/). After
+installing Composer, run the following command from the library root:
+
+`composer install --no-dev --ignore-platform-reqs`
+
+Or to install with phpunit:
+
+`composer install`
+
+## Testing
+
+This library includes a [PHPUnit](https://phpunit.de/) test suite.
+
+### Running PHPUnit tests
+
+Add Composer's vendor directory to your PATH by adding the following line to
+your profile. This is dependent on your system, but on a Linux or Mac OSX system
+using Bash, you'll typically find the file at *~/.bash_profile*.
+
+`export PATH="./vendor/bin:$PATH"`
+
+Bash example:
+
+```shell
+echo 'export PATH="./vendor/bin:$PATH"' >> ~/.bash_profile
+source ~/.bash_profile
+```
+
+Then run PHPUnit:
+
+`phpunit`
+
+### MailChimp API Playground
+
+MailChimp's [API Playground](https://us1.api.mailchimp.com/playground/) provides
+access to all API methods via a web-based UI. You can use this to test API calls
+and review data you've sent to MailChimp.

sites/all/libraries/mailchimp/composer.json

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+{
+  "name": "thinkshout/mailchimp-api-php",
+  "version": "1.0.9",
+  "type": "library",
+  "description": "PHP library for v3 of the MailChimp API",
+  "keywords": ["mailchimp", "mail"],
+  "homepage": "https://github.com/thinkshout/mailchimp-api-php",
+  "require": {
+    "php": ">=5.4.0",
+    "guzzlehttp/guzzle": "^6.2.1"
+  },
+  "require-dev": {
+    "phpunit/phpunit": "^6.2.2"
+  },
+  "autoload": {
+    "psr-4": {
+      "Mailchimp\\": "src/",
+      "Mailchimp\\http\\": "src/http/"
+    }
+  },
+  "autoload-dev": {
+    "psr-4": {
+      "Mailchimp\\Tests\\": "tests/src/"
+    }
+  }
+}