add version code and name to searchable dictionary sample (make it v2)

Change-Id: Ie19c107528ef0df715936303baeda002efaef6cb

Author: scottamain

samples/SearchableDictionary/AndroidManifest.xml

@@ -17,7 +17,9 @@
 */
 -->
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-        package="com.example.android.searchabledict">
+        package="com.example.android.searchabledict"
+        android:versionCode="2"
+        android:versionName="2.0">
 
     <uses-sdk android:minSdkVersion="4" />