Update compatibility with hacs

This release add version in the manifest as required per:
home-assistant/wheels-custom-integrations#297

As well, we added national information in the carbonintensity v0.3.0:
https://pypi.org/project/carbonintensity/0.3.0/

Updated info

0.0.2

updated documentation

First release

Update README.md

Changing urls to be consistent with the repository