Update to Python 3

[manuel-wingtra]

I was wondering if ESPEC is planning to update this library to python 3 since python 2 will reach its end of life on the 01.01.2020. We as a customer of ESPEC would be very happy if the software interface of our Chamber could stay up to date.
I'm looking forward to your answer.

[MylesMetzler]

We use this library internally on a project that is still on using python 2.7 and is currently frozen pending a new release. After that release we plan on looking into adding python 3 support.

A pull request for adding python3 support exists. We have not had time to test it however.

[maxballenger]

I also need python3 compatibility. It should be straightforward to make this library compatible with both python3 and python2, possibly completely automated using tools like https://portingguide.readthedocs.io/en/latest/tools.html#python-modernize. There should be no need to break your 2.7 application.