Send signal after config entry changed.

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change

Comparison is base (6e27283) 100.00% compared to head (ae29102) 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #151 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 13 13 Lines 1431 1435 +4 ========================================= + Hits 1431 1435 +4 ``` | [Impacted Files](https://codecov.io/gh/jonasbkarlsson/ev_smart_charging/pull/151?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jonas+Karlsson) | Coverage Δ | | |---|---|---| | [custom\_components/ev\_smart\_charging/\_\_init\_\_.py](https://codecov.io/gh/jonasbkarlsson/ev_smart_charging/pull/151?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jonas+Karlsson#diff-Y3VzdG9tX2NvbXBvbmVudHMvZXZfc21hcnRfY2hhcmdpbmcvX19pbml0X18ucHk=) | `100.00% <100.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jonas+Karlsson). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jonas+Karlsson)

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