Fix github release script
Fix github release script

Summary: Just a small mispelling in step specification

Reviewed By: mweststrate

Differential Revision: D25053437

fbshipit-source-id: 39e7c9c578a448495b92f8aa3632b2843d79490c

facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper