Release steps

1. Update app/build.gradle

   versionName should be the milestone

   VersionCode should be increased by 1

2. Tag master with release tag

   Example:

   git tag v1.0.16 -m "Akvo Caddisfly app v1.0.16"

   1.0.16 should be replaced by the current milestone

3. Github release

   Close all issues

   Create a github release

   Link all relevant issues or to milestone

4. Build apk for release

   ./gradlew mainExtRelease

5. Upload apk to Android Developer console to the internal testing track