Update gradle build config field parameter
requested to merge gtsiolis/gitter-android-app:update-gradle-build-config-field-parameter into master
Update gradle build config field parameter per https://gitlab.com/gitlab-org/gitter/gitter-android-app/commit/f95ca07ee7c2f8c9285235bc288f5b8788c126ed#note_100821419. Feel free to close if you think this is not necessary.