Update kotlin plugin.
Update kotlin plugin.

Change-Id: I36cc6b1d9cd2dbb1c02f74d3fa683bf8e39dffd6

wikimedia/apps-android-wikipedia,dbrant/apps-android-wikipedia,dbrant/apps-android-wikipedia,wikimedia/apps-android-wikipedia,dbrant/apps-android-wikipedia,wikimedia/apps-android-wikipedia,dbrant/apps-android-wikipedia,wikimedia/apps-android-wikipedia,dbrant/apps-android-wikipedia