link to a useful blog post

pypi no longer requires rst; closes #5

also test pip installing itself

isolate tests into somepackage/tests/; closes #4

one more reference

a more explicit name for another_function

a bit more lengthy but hopefully clearer

modify some_function to a more explicit version

more explicit example for the internal function

refactor version.py: keep it simple

add links to great reading/tools

prefer functions

one more tip

mention mypy; closes #3

mention pipenv; closes #2