Python 3 compatibility

[PhilippSelenium]

Will this be ported to work with python 3?
https://caniusepython3.com/project/collectd

[EliAndrewC]

@PhilippSelenium: I no longer work at Applied Security but apparently they never removed me from the company Github group, so I've pushed a branch with Python 3 support and opened a pull request:
#8

Someone will need to review it and actually test it against a live collectd server, which I can't easily do - I made sure all the unit tests pass, and the code coverage is pretty comprehensive so I feel pretty good about it overall.