pylint on github actions

[adamglos92]

Currently pylint is used only locally when for testing docstrings. GitHub actions fail with error

Running: pylint omniqubo
Traceback (most recent call last):
  File "/usr/local/bin/pylint", line 8, in <module>
    sys.exit(run_pylint())
  File "/usr/local/lib/python3.8/site-packages/pylint/__init__.py", line 24, in run_pylint
    PylintRun(sys.argv[1:])
  File "/usr/local/lib/python3.8/site-packages/pylint/lint/run.py", line 320, in __init__
    linter.load_config_file()
  File "/usr/local/lib/python3.8/site-packages/pylint/config/option_manager_mixin.py", line 314, in load_config_file
    self.global_set_option(option, value)
  File "/usr/local/lib/python3.8/site-packages/pylint/config/option_manager_mixin.py", line 186, in global_set_option
    self._all_options[opt].set_option(opt, value)
  File "/usr/local/lib/python3.8/site-packages/pylint/config/options_provider_mixin.py", line 54, in set_option
    value = _validate(value, optdict, optname)
  File "/usr/local/lib/python3.8/site-packages/pylint/config/option.py", line 105, in _validate
    return _call_validator(_type, optdict, name, value)
  File "/usr/local/lib/python3.8/site-packages/pylint/config/option.py", line 86, in _call_validator
    return VALIDATORS[opttype](optdict, option, value)
  File "/usr/local/lib/python3.8/site-packages/pylint/config/option.py", line 74, in <lambda>
    "choice": lambda opt, name, value: _choice_validator(opt["choices"], name, value),
  File "/usr/local/lib/python3.8/site-packages/pylint/config/option.py", line 31, in _choice_validator
    raise optparse.OptionValueError(msg % (name, value, choices))
optparse.OptionValueError: option spelling-dict: invalid value: 'en_US', should be in ['']
Pylint error

Likely cause because of missing pyenchant dependency