python 3 statement

• In 2020 I will stop publicly supporting python2.x in my libraries and tools
• I will be requiring python3.6+, this allows me to do the following:
  • remove python2 specific code
  • use type annotations including variable annotations
  • use f-strings
• if you need me to support older python versions, please reach out to me directly
  • twitter
  • email: (find my email address through my git commits -- use the umich.edu address)

Some exclusions:

• future-fstrings will likely still support python2 but will not receive (much/any) maintenance

3.6.0

I will also be dropping 3.6.0 (patch version 0, not all of 3.6.x) as its implementation of typing.NamedTuple is broken