Add tox.ini for typing_extensions (#733)

It supports running its tests for all supported Python versions:
2.7 and 3.4-3.9, which are different from those for "typing" package
itself that is intended primarily for 2.7 and 3.4 where "typing"
module is not included in the standard library.
1 file changed
tree: 1b25319ab51767872ab6dcec4d4ddb71ec31117e
  1. src_py2/
  2. src_py3/
  3. LICENSE
  4. MANIFEST.in
  5. README.rst
  6. setup.cfg
  7. setup.py
  8. tox.ini