Add supported python version info to readme file
Add supported python version info to readme file

Squashed commit of the following:

commit 89c4b457c35a3c2d293f13546a9ba4068f07443a
Author: Idaho Frost <frostidaho@gmail.com>
Date:   Sun Feb 11 14:05:54 2018 -0500

    Add note on supported python versions under installation section

commit a79193a9aaa6823c590917343095cd8031a1cc5e
Author: Idaho Frost <frostidaho@gmail.com>
Date:   Sun Feb 11 14:01:48 2018 -0500

    Add a badge to readme showing supported python versions

frostidaho/dynmen