Drop EOL Python versions support

[EvaSDK]

I was looking into implementing fixes for some tickets (PEP 3119 support, #61) but it is a bit complicated to setup a virtualenv for Python 2.7 and these days, there should be not much trouble saying Python 2 is dead and we should move forward.

• Would it be acceptable to provide a pull request removing support for Python 2?
• Same question but for other EOL Python 3 releases.

[djbios]

+1 for dropping Python 2 support