added google hangout reponse && static analysis fixed

[martialo12]

• I did some static analysis(fixing for example trailing spaces....) with flake8
• I added a class for managing google hanghout response(I tried it in my own project and it's working perfectly)

[martialo12]

I set up github actions for python. This way github actions will failed if someone push something tha doesn't respect the PEP8 Standard
I highly recommend this because it's a best practise when it comes to write python code.