bugfix #453 Fix RandomWikipedia's bug. Fix #453.
bugfix #453 Fix RandomWikipedia's bug. Fix #453.

Overview
Add ProGuard settings.

See
https://github.com/square/moshi/issues/345#issuecomment-337328427

toastkidjp/Yobidashi_kt,toastkidjp/Jitte,toastkidjp/Yobidashi_kt,toastkidjp/Jitte