chore(Runtime): add guide for updateChecker usage

Author: floydkim

CodePush.js

@@ -631,6 +631,10 @@ function codePushify(options = {}) {
     );
   }
 
+  if (options.updateChecker && !options.releaseHistoryFetcher) {
+    throw new Error('If you want to use `updateChecker`, pass a no-op function to releaseHistoryFetcher option. (e.g. `releaseHistoryFetcher: async () => ({})`)');
+  }
+
   sharedCodePushOptions.setReleaseHistoryFetcher(options.releaseHistoryFetcher);
   sharedCodePushOptions.setUpdateChecker(options.updateChecker);
 

typings/react-native-code-push.d.ts

@@ -57,7 +57,14 @@ export interface CodePushOptions extends SyncOptions {
     /**
      * Specifies a function to get the release history.
      *
-     * (If you want to use `updateChecker`, pass no-op function.)
+     * If you want to use `updateChecker`, pass no-op function like below.
+     * But it is deprecated and will be removed in the next major version.
+     *
+     * ```ts
+     * const codePushOptions: {
+     *     releaseHistoryFetcher: async () => ({}), // This will not be called
+     * }
+     * ```
      */
     releaseHistoryFetcher: (updateRequest: UpdateCheckRequest) => Promise<ReleaseHistoryInterface>;
     /**