aiohttp: RuntimeWarning: coroutine 'noop' was never awaited (4.0.0a1-py3.6 / 3.6.2-py3.8)

Description

When using the lastest slackclient, which pulls in the aiohttp in setup.py with

install_requires=["aiohttp>3.5.2"],

Results in aiohttp version 4.0.0.a1. When using this version I noticed the following output when invoking the WebClient api calls, for example chat_postMessage

/Users/jeremy/venv/lib/python3.6/site-packages/aiohttp-4.0.0a1-py3.6-macosx-10.14-x86_64.egg/aiohttp/client.py:977: RuntimeWarning: coroutine 'noop' was never awaited

If I downgraded the version of aiohttp to < 4.0, I obtain version 3.6.2 . I no longer see the above issue when using this version.

I don't know if this issue rises to the level of a "bug" per-se since I don't see any issue in my app; and I believe this might just be a warning. Unsure. I did find this one related bug:
https://github.com/aio-libs/aiohttp/issues/4282.

What type of issue is this? (place an x in one of the [ ])

• bug
• enhancement (feature request)
• question
• documentation related
• testing related
• discussion

Requirements (place an x in each of the [ ])

• I've read and understood the Contributing guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.
• I've searched for any related issues and avoided creating a duplicate issue.

Bug Report

Filling out the following details about bugs will help us solve your issue sooner.

Reproducible in:

slackclient version: 2.0

python version: 3.6.8

OS version(s): MacOS Mojave

Steps to reproduce:

1. Use aiohttp >= 4.0
2. Execute any WebClient api call
3. observe the RuntimeWarning as noted
4. Downgrade aiohttp < 4.0
5. Re-execute any WEbClient api call
6. Do not observe the RuntimeWarning.

Expected result:

Ideally be able to use the latest aiohttp library and not see this RuntimeWarning

Actual result:

Currently observing RuntimeWarning with aiohttp > 4.0

Attachments:

Logs, screenshots, screencast, sample project, funny gif, etc.

Inizia da setup.py e dal percorso di chiamata dell’API WebClient descritto nel report, quindi riproduci l’avviso usando aiohttp >= 4.0 con Python 3.6. Confronta il comportamento con aiohttp 3.6.2 e determina se l’avviso proviene dall’SDK o dalla sua dipendenza. Il lavoro è completato quando le chiamate WebClient interessate non emettono più la RuntimeWarning segnalata nell’intervallo di dipendenze supportato.