fix for SSLError - new arg --verify <CA_BUNDLE>

[c-w-m]

SSLError #346 final

• implementation of new arg (--verify <CA_BUNDLE> to allow requests.get setting of verify arg

• testing updates

  • testing exposed one error (ommision) in the implementation which was fixed ;-)
  • added import dotnet used with testing to allow .env.test file for setting CA_BUNDLE environment variable
  • added tests_requirements to setup.py to support $ python setup.py test
  • added requirements-dev.txt to support development (includes black for formatting)
  • new settings.py file used in testing to read in either environment variable or .env.test variable
  • tox file revised to now include py3.10 and a development build of py3.11
  • /.github/workflow/tests.yml were not updated (they still have python-version: [3.7, 3.8, 3.9, pypy-3.7])

• doc updates

  • README.rst has new --verify option
  • CONTRIBUTING.rst note that 3.7 to 3.10 should pass (3.11 needs work)

• final tox runs attached

  • 4_fix_SSLError_format_final.txt

• .vscode directory added (it can be ignored if not of interest, my bad)

Cheers

---

last bit/suggestion

• update CONTRIBUTING.rst with note on setting CA_BUNDLE if needed (see below)
• and capture the results to a file to submit with pull request

5. When you're done making changes, check that your changes pass flake8 and the tests, including testing other Python versions with tox::

   $ flake8 pipreqs tests > flake8_pipreqs_tests_results.txt

• if needed, set the CA_BUNDLE value in the .env.test file located in tests/ (or set an environment variable)

  $ python setup.py test > python_setup_tests_pipreqs_results.txt

  $ tox > tox_pipreqs_results.txt

[jonas-eschle]

Thanks also for this PR! What do you think, should we still add this?