[BUG] Home Assistant 2021.3.0 requires version number in manifest

[robinsmidsrod]

Environment

• ShellyForHASS release with the issue: 0.2.1
• Last working ShellyForHASS release (if known): none
• Home Assistant Core release with the issue: 2021.3.0
• Operating environment (Home Assistant/Supervised/Docker/venv): Docker

Describe the bug

I'm getting an error message in my Home Assistant log saying that this integration is missing version information in the manifest.

Steps to Reproduce

Upgrade HA to 2021.3.0 and restart it.

Expected behavior

No message about missing version in manifest.

Screenshots

Traceback/Error logs

2021-03-04 09:04:34 WARNING (MainThread) [homeassistant.loader] No 'version' key in the manifest file for custom integration 'shelly'. This will not be allowed in a future version of Home Assistant. Please report this to the maintainer
of 'shelly'

Additional context