Python3 bytes => string output issue

[thisisparker]

If you run this in Python3, you might run into a an issue during file output where it says "output must be a string, not bytes." It's easy to fix that by just removing the ".encode('utf-8')" part on line 119 of gutengrep.py, but based on some of the other functions here that might screw up the way it gets shown in the terminal on Windows.

In any case, I know this software is a few years old and if it works for you it's probably not worth changing. Filing this issue in case other people run into the problem, though.

[hugovk]

Thanks for the report! I originally wrote this for Python 2.7, but am happy for PRs for Python 3.

Don't worry about Windows, I can adjust that later if needed.