Option class should have all methods of Full and Empty

[joshalbrecht]

Otherwise pylint complains (fairly) that Option does not have, for example, "map".

Just add these lines at monad.py:72

    def map(self, callback):
        raise NotImplementedError()

    def filter(self, callback):
        raise NotImplementedError()

    def get_or(self, default):
        raise NotImplementedError()

    def get_or_call(self, callback, *args, **kwargs):
        raise NotImplementedError()

    def or_else(self, default):
        raise NotImplementedError()

    def or_call(self, callback, *args, **kwargs):
        raise NotImplementedError()

This is a pretty minor issue and somewhat stylistic, so feel free to ignore :) Thanks for the nice library!

[kachayev]

Fixed 6aad4d2
Thanks for reporting!