title: AirWatch complains App Version Code hasn't changed (but it has)
body: <p>AirWatch believes the version code on the latest version of an apk has not been increased since the previous version.</p>
  
  <p>We have recently upgraded the Android Studio build tools from 25.0.0.0 to 26.0.0.2 and the problem seems to be related to this change.</p>
  
  <p>The version code is stored in the apk (which is a zip file) in a file AndroidManifest.xml.  AndroidManifest.xml is a binary file.</p>
  
  <p>What do I need to change to force Android Studio to write the version code to the apk AndroidManifest.xml in such a way that AirWatch will recognise it?</p>
  
  <p>My app is using features of SDK 26 which means it would be very painful to revert to an earlier version that is supported by build tools 25.0.0.0.</p>