Typo in podsixnet2 package on PyPi

Hi Chris,

When installing podsixnet2 as follows, I get an error about not being in a git repo:

```
$ pip install podsixnet2
Collecting podsixnet2
Using cached podsixnet2-2.0.1.tar.gz (12 kB)
ERROR: Command errored out with exit status 1:
command: /home/mond/python-virtualenvs/cocos2d_pyglet-1.5/bin/python -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-vaosdd_x/podsixnet2/setup.py'"'"'; __file__='"'"'/tmp/pip-install-vaosdd_x/podsixnet2/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-pip-egg-info-rofalij9
cwd: /tmp/pip-install-vaosdd_x/podsixnet2/
Complete output (10 lines):
fatal: not a git repository (or any of the parent directories): .git
Traceback (most recent call last):
File "", line 1, in
File "/tmp/pip-install-vaosdd_x/podsixnet2/setup.py", line 17, in
__version__ = subprocess.check_output(["git", "describe", "--tag", "--always"]).decode("utf8").strip("\n")
File "/usr/lib/python3.8/subprocess.py", line 411, in check_output
return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
File "/usr/lib/python3.8/subprocess.py", line 512, in run
raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '['git', 'describe', '--tag', '--always']' returned non-zero exit status 128.
----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
```

Which happens because in the setup.py file it incorrectly has the directory as podsixnet rather than podsixnet2

```python
versionfile = "podsixnet/version.py"
if not os.path.isfile(versionfile):
# assume git checkout
__version__ = subprocess.check_output(["git", "describe", "--tag", "--always"]).decode("utf8").strip("\n")
else:
# created by pip
exec(open(versionfile).read())
```

After changing `versionfile` I am able to install it.

I think it would be useful to update the 'Project description' [page](https://pypi.org/project/podsixnet2/) to explain why there are two packages and that they are functionally equivalent (as I had to delve into previous issues #26 and PRs #35 #37 to find out :smile:).

Many thanks.

Start with setup.py and inspect the versionfile path shown in the issue, then reproduce pip install podsixnet2 from PyPI. Done means the package installs without requiring a git checkout and the PyPI project description explains why podsixnet and podsixnet2 exist and that they are functionally equivalent.

Written by the indexing model from the issue text.