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
docs/conf.py
if config:
        jinja_contexts = {'config_ctx': {"configs": config}}
        extensions.append('sphinxcontrib.jinja')
# -- Options for sphinx.ext.autodoc --------------------------------------------
# 
# This value contains a list of modules to be mocked up. This is useful when some external dependencies
# are not met at build time and break the building process.
autodoc_mock_imports = [
    'MySQLdb',
    'adal',
    'analytics',
    'azure',
    'azure.cosmos',
    'azure.datalake',
    'azure.kusto',
    'azure.mgmt',
    'boto3',
    'botocore',
    'bson',
    'cassandra',
    'celery',
    'cloudant',
    'cryptography',
    'cx_Oracle',
    'datadog',
    'distributed',
    'docker',
    'google',
    'google_auth_httplib2',
    'googleapiclient',