watchmedo - argparse for --kill-after needs to be a float

[cbellinz]

If you set --kill-after argument on watchmedo then it will fail as the argparse configuration is not set to a float.

It needs to be:

          argument('--kill-after',
                   dest='kill_after',
                   default=10.0,
                   type=float,
                   help='When stopping, kill the subprocess after the specified timeout '
                   'in seconds (default 10.0).')])

[BoboTiG]

Good catch!

If anyone wants to give a hand, a potential patch should contain a test case :)