Adapters.md in flipper-0.21.0.rc1

- old
+ new

@@ -12,9 +12,10 @@
 * [Moneta adapter](https://github.com/jnunemaker/flipper/blob/master/docs/moneta)
 * [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
 * [read-only adapter](https://github.com/jnunemaker/flipper/blob/master/docs/read-only)
 * [Redis adapter](https://github.com/jnunemaker/flipper/blob/master/docs/redis)
+* [Rollout adapter](rollout/README.md)
 * [Sequel adapter](https://github.com/jnunemaker/flipper/blob/master/docs/sequel)
 
 ## Community Supported
 
 * [Active Record 3 adapter](https://github.com/blueboxjesse/flipper-activerecord)