Create a shell script to automatically update the version number

[AliShahpurwala]

I've created a small shell script to automatically update the version number is setup.cfg (Line 2) and setup.py (Line 12 & 13). The script requires an argument (explained at the top of the file). I've done some basic testing and it seems to be working properly.

[Milind220]

That's actually a better implementation than the script that I had in mind. I really like the fact that by taking major, minor, or patch as its argument, it also prevents someone from mistakenly skipping a version number.

Awesome!