Updates the CHANGES.md as we've released 0.4.0.
Updates the CHANGES.md as we've released 0.4.0.

infinitered/reactotron,rmevans9/reactotron,rmevans9/reactotron,rmevans9/reactotron,infinitered/reactotron,rmevans9/reactotron,reactotron/reactotron,infinitered/reactotron,reactotron/reactotron,reactotron/reactotron,reactotron/reactotron,rmevans9/reactotron,infinitered/reactotron,reactotron/reactotron