Adapters.md in flipper-0.11.0.beta7

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 I plan on supporting the adapters in the flipper repo. Other adapters are welcome, so please let me know if you create one.
 
 ## Officially Supported
 
 * [ActiveRecord adapter](https://github.com/jnunemaker/flipper/blob/master/docs/active_record) - Rails 3, 4, and 5.
+* [CacheStore adapter](https://github.com/jnunemaker/flipper/blob/master/docs/cache_store) - ActiveSupport::Cache::Store
 * [Cassanity adapter](https://github.com/jnunemaker/flipper-cassanity)
 * [Http adapter](https://github.com/jnunemaker/flipper/blob/master/docs/http)
 * [memory adapter](https://github.com/jnunemaker/flipper/blob/master/lib/flipper/adapters/memory.rb) – great for tests
 * [Mongo adapter](https://github.com/jnunemaker/flipper/blob/master/docs/mongo)
 * [PStore adapter](https://github.com/jnunemaker/flipper/blob/master/lib/flipper/adapters/pstore.rb) – great for when a local file is enough