Bump up AOSP Contacts version to 1.5.11

bug:28880104
Change-Id: I02689c4d64ffd8b5cbbcb2276a3963fc25c6e68e
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 1987fb2..230fe9d 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -16,8 +16,8 @@
 
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.android.contacts"
-    android:versionCode="10510"
-    android:versionName="1.5.10">
+    android:versionCode="10511"
+    android:versionName="1.5.11">
 
     <uses-sdk android:minSdkVersion="21" android:targetSdkVersion="25" />