Sleeps after last unsuccessful call to target before raising MaxCallException

[troyhoffman]

Example code:
``def target_method():
print('called')
return False

poll(target_method, step=5, max_tries=2)``

Behavior:
Prints "called", waits 5 seconds, prints "called", waits 5 seconds, raises polling.MaxCallException

Expected:
Prints "called", waits 5 seconds, prints "called", raises polling.MaxCallException immediately

The problem will be more noticeable with a high step value. With a step value of 300, it will wait 5 minutes between failing and raising the exception. Fix is to move the check and raise to before the sleep instead of the top of the loop.

[troyhoffman]

Pull request created (#12)

[troyhoffman]

My PR was failing CI. Looking into this, since it passed the tests locally.

[ddmee]

This has been fixed in https://pypi.org/project/polling2/

[VeNoMouS]

@justiniso are you going to address this issue?