message: [Messaging] Render an optimistic response after sending a message.
diff: @@ -203,6 +203,18 @@ class SendConversationMessageMutation extends Relay.Mutation<MutationProps, any>
  ]
  }
  + getOptimisticResponse() {
  + return {
  + messageEdge: {
  + node: {
  + raw_text: this.props.body_text,
  + is_from_user: true,
  + created_at: new Date().toISOString(),
  + attachments: [],
  + },
  + },
  + }
  + }
  }
  export default Relay.createContainer(Conversation, {
  