Switch from SIGALRM to `threading.Timer`

Changes:

• #11

The one where it doesn't signal alarm on success

Okay last time to update the password

Signed-off-by: Eli Uriegas <eli.uriegas@docker.com>

Changing timeout to SIGALRM

Changelog:

• Change timeout to SIGALRM, it's more accurate and doesn't rely on a function to be finished running in order for it to raise an MaxTimeoutExceeded exception

v1.3

success being none now works alongside an interval parameter

Adding decorator dependency

Now relies on decorator dependency to introduce proper function signatures.

Adding timeout param

• Adds the timeout parameter