Log Message:
Update py-flask-script to 2.0.3.

No changelog provided.

* bug fixes, documentation improvements
* better sub-manager option handling

Incompatible changes:
* command.handle() is now simply command()
* short help is '-?'. '-h' is used for --host too often.
* Server options '-d' and '-r' are no longer toggles for debugging/reloading.
  Instead, '-d' forces debugging on and '-D' forces it off,
  no matter what the default said.
* The command.prompt_* compatibility methods have beeen removed.
  (They were already heavily deprecated.)