Update CardAction to make image or title required

Author: Corina

CHANGELOG.md

@@ -4,8 +4,18 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
+<!-- CHANGELOG line template
+### Added/Changed/Removed
+- Added something, by [@johndoe](https://github.com/johndoe), in PR [#XXX](https://github.com/Microsoft/BotFramework-WebChat/pull/XXX)
+### Changed (for dependency bumps)
+- `core`: Bumps to [`abc@1.2.3`](https://npmjs.com/package/abc/), in PR [#XXX](https://github.com/Microsoft/BotFramework-WebChat/pull/XXX)
+### Fixed
+- Fix [#XXX](https://github.com/Microsoft/BotFramework-WebChat/issues/XXX). Patched something, by [@johndoe](https://github.com/johndoe) in PR [#XXX](https://github.com/Microsoft/BotFramework-WebChat/pull/XXX)
+-->
 ## [Unreleased]
 
+- Added `messageBack` to `CardActionTypes` and updated `CardAction` fields, by [@corinagum](https://github.com/corinagum), in PR [#138](https://github.com/Microsoft/BotFramework-DirectLineJS/pull/138)
+
 ## [0.10.1] - 2018-12-21
 ### Changed
 

src/directLine.ts

@@ -53,15 +53,26 @@ export interface UnknownMedia{
 
 export type CardActionTypes = "call" | "downloadFile" | "imBack" | "messageBack" | "openUrl" | "playAudio" | "playVideo" | "postBack" |  "signin" | "showImage";
 
-export interface CardAction {
+export type CardAction =  CardActionWithImage | CardActionWithTitle;
+
+export interface CardActionWithImage {
     displayText?: string,
-    image?: string,
+    image: string,
     text?: string,
     title?: string,
     type: CardActionTypes,
     value?: any
 }
 
+export interface CardActionWithTitle {
+    displayText?: string,
+    image?: string,
+    text?: string,
+    title: string,
+    type: CardActionTypes,
+    value?: any
+}
+
 export interface CardImage {
     alt?: string,
     url: string,