update copyright year in the CLI usage output
update copyright year in the CLI usage output

Summary: Just happened to notice while looking for stuff to cleanup.

Reviewed By: sid0

Differential Revision: D4418272

fbshipit-source-id: edcfc633187a9db2584b3056db68a18e9ebfe63a

wez/watchman,nodakai/watchman,nodakai/watchman,nodakai/watchman,kwlzn/watchman,wez/watchman,nodakai/watchman,nodakai/watchman,facebook/watchman,facebook/watchman,kwlzn/watchman,wez/watchman,facebook/watchman,wez/watchman,kwlzn/watchman,facebook/watchman,nodakai/watchman,facebook/watchman,kwlzn/watchman,nodakai/watchman,facebook/watchman,kwlzn/watchman,nodakai/watchman,nodakai/watchman,wez/watchman,wez/watchman,facebook/watchman,wez/watchman,wez/watchman,kwlzn/watchman,facebook/watchman,facebook/watchman,kwlzn/watchman,wez/watchman