What's with python 3.6 requirement? - Major stable distros are at python 3.5. So I can't even try it without messing with system python or OS.
I'm sorry this makes using my tool harder for you but I'm sure there is an easy way for you to install Python 3.6 without destroying your system Python. There's Homebrew for macOS, deadsnakes for Ubuntu, EPEL for RedHat, and so on.