Adds new integration [eseglem/hass-wattbox]

[eseglem]

wheel-custom-integrations PR: home-assistant/wheels-custom-integrations#40

brands PR: home-assistant/brands#1590

Before you submit a pull request, please make sure you have done the following:

• You are submitting only 1 repository.
• You repository is compliant with https://hacs.xyz/docs/publish/start
• You have tested it with HACS by adding it as a custom repository.
• The list are still alphabetical after my change.

To the best of my knowledge those PRs bring it into compliance with the start guidance.

[hacs-bot]

Running checks on eseglem/hass-wattbox

[eseglem]

Guess I had an outdated key in the manifest. Corrected that. Waiting on the other PRs or additional feedback to see if the validation will get fixed by them.

[eseglem]

I think the last check should work now. https://github.com/eseglem/hass-wattbox/runs/663415753 seems to indicate it will.

[hacs-bot]

Your repository is now added to HACS 🎉

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