setup.py fixes

[vgavro]

• before this fix package was not installed (because of NameError) - bug introduced in https://github.com/rehabstudio/fbmessenger/pull/71
• fixed install and test dependencies
• also this PR contains https://github.com/rehabstudio/fbmessenger/pull/84
• version updated, because of last released version (2019) doesn't contain python3.9+ fix.

I expect that package on pypi and repository is abandoned, please consider transfering rights on pypi package not to release it under alternative name, thanks!

[gaetan1903]

this repository seems to be no longer maintained.

you can try the framework Ampalibe for creating bot messenger and contribute