Migrate to python3 style super for new class snippets in language-python

[bridgetjs]

The language-python snippets seem to be somewhat outdated when it comes to declaring new classes. My main source for this is this post on stackoverflow

This PR proposes to change the default snippet to python3 style

#Old Python2 Style super

class ClassName(object):
    """docstring for ."""

    def __init__(self, arg):
        super(ClassName, self).__init__()
        self.arg = arg

#Python3 Style Super      
class ClassName(object):
    """docstring for ."""

    def __init__(self, arg):
        super().__init__()
        self.arg = arg

This can of course be fixed by users with their own snippets as I've done, but I thought I'd submit a PR for other users