Adapters.md in flipper-0.18.0

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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.
+* [ActiveRecord adapter](https://github.com/jnunemaker/flipper/blob/master/docs/active_record) - Rails 3, 4, 5, and 6.
 * [ActiveSupportCacheStore adapter](https://github.com/jnunemaker/flipper/blob/master/docs/active_support_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
 * [Moneta adapter](https://github.com/jnunemaker/flipper/blob/master/docs/moneta)