Bump ios build number

Author: pfrazee

app.config.js

@@ -20,7 +20,7 @@ module.exports = function () {
   /**
    * iOS build number. Must be incremented for each TestFlight version.
    */
-  const IOS_BUILD_NUMBER = '2'
+  const IOS_BUILD_NUMBER = '3'
 
   /**
    * Android build number. Must be incremented for each release.