Update target SDK version to 19

Change-Id: I38a6a839fced506ebdf6f0eee5318453061a6b05
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index b48381c..a7b39e9 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -28,7 +28,7 @@
     <uses-permission android:name="android.permission.NFC" />
 
     <!-- This needs to be present when we are doing unbundled releases. -->
-    <uses-sdk android:targetSdkVersion="17" android:minSdkVersion="14" />
+    <uses-sdk android:targetSdkVersion="19" android:minSdkVersion="14" />
 
     <application
         android:icon="@mipmap/ic_launcher_mail"