Fix post title native syntax (#14041)

* Fix unexpected token in native code

* Dummy commit to trigger Travis

* Include the rnmobile release branch to Travis builds

.travis.yml

@@ -21,6 +21,7 @@ cache:
 branches:
   only:
     - master
+    - rnmobile/release-v1.0
 
 before_install:
   - nvm install

packages/editor/src/components/post-title/index.native.js

@@ -21,13 +21,12 @@ import styles from './style.scss';
 const minHeight = 30;
 
 class PostTitle extends Component {
-	titleViewRef: Object;
-
 	constructor() {
 		super( ...arguments );
 
 		this.onSelect = this.onSelect.bind( this );
 		this.onUnselect = this.onUnselect.bind( this );
+		this.titleViewRef = null;
 
 		this.state = {
 			isSelected: false,