Resolve "Handle return codes and messages"

Closes #8

See merge request infrablue/python-bigbluebutton2!39

Resolve "Catch errors of the bbb servers"

Closes #34

See merge request infrablue/python-bigbluebutton2!38

Update dependency flake8-rst-docstrings to ^0.0.14

See merge request infrablue/python-bigbluebutton2!37

Update dependency isort to v5

See merge request infrablue/python-bigbluebutton2!28

Update dependency pytest to v6

See merge request infrablue/python-bigbluebutton2!31

Update dependency flake8-isort to v4

See merge request !36