Create requirements.txt for GitHub Actions w/o pytest

[agardnerIT]

Create a new requirements-dev.txt which contains 3 dependencies:

• requests
• PyInstaller
• pytest

Why?

GitHub actions currently runs pip install -r requirements.txt which includes pytest.

GitHub actions build binaries workflow doesn't use pytest to this is inefficient and pointless.

By having two files, we can have one for the developers (who need pytest) and one for everyone else (who probably doesn't).

[agardnerIT]

Being done by @viktoriussuwandi (if you drop a comment here I'll assign this to you)

[viktoriussuwandi]

working on it

[agardnerIT]

All done in #59 . Thanks!!