Python3.7 sarge installation fails because of async keyword

[Kshitij Karthick]

Seems like in the codebase currently the issue is fixed with async_ rather than async. But the pip package still seems to have the issue, causing the build to fail.

Using cached https://files.pythonhosted.org/packages/bc/9a/a715357f0f0a394edf964fb52b8b39551b629f4d1c996ade5f600fb3d278/sarge-0.1.4.tar.gz
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-install-0ja71o2x/sarge/setup.py", line 11, in <module>
        import sarge
      File "/tmp/pip-install-0ja71o2x/sarge/sarge/__init__.py", line 604
        def run(self, input=None, async=False):
                                      ^
    SyntaxError: invalid syntax

[Vinay Sajip]

Duplicate of #38.