Fail on attempting to install on python2 (#101)
Fail on attempting to install on python2 (#101)

* Fail on attempting to install on python2

no longer compatible with python2's urllib

```
  ...
  prawcore/exceptions.py:2: in <module>
      from urllib.parse import urlparse
  E   ImportError: No module named parse
  builder for '/nix/store/3l1rqygq58hbwyzn6fqx8x4djbmzgggh-python2.7-prawcore-1.4.0.drv' failed with exit code 4
```

* Apply suggestions from code review

Co-authored-by: PythonCoderAS <44b245f48a75e13bb6d783901bf5b980afb786f6@users.noreply.github.com>

Co-authored-by: PythonCoderAS <44b245f48a75e13bb6d783901bf5b980afb786f6@users.noreply.github.com>
praw-dev/prawcore