Could you please fix PyPi release?

[frol]

First of all, PyPi states that prettyplotlib version is 0.1.7, which does not exist in this repo at all! The source code published on PyPi seems to match 0.1.4 release, while the latest version I see in this repo is 0.1.5.

It seems that the best solution would be to update the version to 0.1.8 (so the code, which relies on the "ghost" 0.1.7 version won't get broken, and versions order is still correct (the newer version has a higher number)).

Thank you for your great project! It made me believe that matplotlib can draw beautiful things.

P.S. I know that this project is not maintained anymore, but I bumped into this issue while maintaining my old notebooks.