Added Changelog

CHANGELOG.md

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+2.0.0
+======
+
+  * Add a Symfony command to update the status of a feature
+  * Added Symfony command to get the status of a feature
+  * Added PersistenStorageInterface to identify storage adapters that can persist the storage
+  * Removed functions
+  * Don't memoize callables and expressions
+  * Update Toggle to take an instance of an ExpressionLanguage class
+  * Created a factory method for Config
+  * Added ArrayStorage class, update Toggle to accept a StorageInterface instead of a Config, and made Config a factory for any storage
+  * Added YamlFileStorage
+  * Added RedisStorage
+  * Remove static methods and moved config into the Config class
+  * Drop support for PHP 5 and PHP 7.0
+  * Add a New Namespace