Fix RuntimeException, remove jcenter and upgrade dependencies#258

PierreVieira wants to merge 1 commit intoandroid:start_kotlinandroid/codelab-android-workmanager:start_kotlinfrom

PierreVieira:fix_runtime_exception_on_start_kotlinPierreVieira/android-workmanager:fix_runtime_exception_on_start_kotlinCopy head branch name to clipboard