Update the bump version script
Update the bump version script

Summary: Updates the bump_version script to update the flipperkit version in Tutorial's Podfile.

Reviewed By: passy

Differential Revision: D16916433

fbshipit-source-id: dd5cf24fbbe4e9ca322178632613caebe178cc17

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