Hello,

Slack has released updates to its library and we can start using it for it. 

We especially like one change.

> slack_sdk has no required dependencies. This means aiohttp is no longer automatically resolved.

I've looked through the documentation and it doesn't look like a difficult task, but I think it's still worth testing.
More info: https://slack.dev/python-slack-sdk/v3-migration/index.html#from-slackclient-2-x

Best regards,
Kamil Breguła
setup.py
'docutils',
    'flake8>=3.6.0',
    'flake8-colors',
    'flaky',
    'freezegun',
    'github3.py',
    'gitpython',
    'importlib-resources~=1.4',
    'ipdb',
    'jira',
    'jsonpath-ng',
    
    
    'mock<4.0.3',
    'mongomock',
    'moto',
    'mypy==0.770',
    'parameterized',
    'paramiko',
    'pipdeptree',
    'pre-commit',
    'pylint==2.6.0',
    'pysftp',
    'pytest',
    'pytest-cov',
    'pytest-instafail',
    'pytest-rerunfailures',
    'pytest-timeouts',
    'pytest-xdist',
    'pywinrm',