TODOs: Upgrade to the 2.2.x line for vanadium-android

Corresponds with good changes to syncbase and rpc.

Change-Id: I4ed490504e43a0ab35c4545368997990fd14cc01
diff --git a/app/build.gradle b/app/build.gradle
index dea5533..31ff599 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -82,6 +82,6 @@
             'com.google.guava:guava:19.0'
     )
     firebaseCompile 'com.firebase:firebase-client-android:2.5.2'
-    syncbaseCompile 'io.v:vanadium-android:2.1.+'
+    syncbaseCompile 'io.v:vanadium-android:2.2.+'
     syncbase2Compile 'io.v:syncbase:0.1.4'
 }