Switch to MIT license
Switch to MIT license

Summary: More new files with old licenses creeping in, switch to MIT license.

Reviewed By: minjang

Differential Revision: D8704719

fbshipit-source-id: e307ab5040eb9e5ad8880da542bd9139d1ad6be1

facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex