thought-machine/please v9.0.0

Please v9.0.0

on GitHub

This is Please v9.0.0

• Better support for multiple Python versions; should now support python 2.7, 3.4, 3.5
  and 3.6 for bootstrap, and binary artifacts for all of those are written for coverage
  in generated test pexes.
• Removed a number of esoteric builtin rules: github_file, git_repo, fpm_package and
  fpm_deb. Removed long-deprecated go_yacc rule and link argument to filegroup.
  Removed rules are available at github.com/thought-machine/pleasings as build_defs
  files; they will still work equivalently but it's unnecessary to have those built
  into the core.