Update to Kotlin 1.2.40
Update to Kotlin 1.2.40

Summary: New version

Reviewed By: sjkirby

Differential Revision: D7795038

fbshipit-source-id: bbafb899f1f90f865b107b72de9d2d03e385fc02

facebook/screenshot-tests-for-android,facebook/screenshot-tests-for-android,facebook/screenshot-tests-for-android,facebook/screenshot-tests-for-android