version bump 29 alpha

Author: danielweck

SDKLauncher-Android/app/src/main/AndroidManifest.xml

@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="org.readium.sdk.android.launcher"
-    android:versionCode="28"
-    android:versionName="1.28" >
+    android:versionCode="29"
+    android:versionName="1.29" >
 
     <uses-sdk
         android:minSdkVersion="19"