Mark async tests with `@pytest.mark.asyncio`

[codecov[bot]]

Codecov Report

Base: 24.92% // Head: 73.86% // Increases project coverage by +48.93% :tada:

Coverage data is based on head (ff79cf6) compared to base (8192f0d). Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## 29-support-reading-of-multiple-values-at-once #58 +/- ## ================================================================================== + Coverage 24.92% 73.86% +48.93% ================================================================================== Files 7 7 Lines 329 329 ================================================================================== + Hits 82 243 +161 + Misses 247 86 -161 ``` | [Impacted Files](https://codecov.io/gh/golles/ha-kamstrup_403/pull/58?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Sander) | Coverage Δ | | |---|---|---| | [...tom\_components/kamstrup\_403/pykamstrup/kamstrup.py](https://codecov.io/gh/golles/ha-kamstrup_403/pull/58?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Sander#diff-Y3VzdG9tX2NvbXBvbmVudHMva2Ftc3RydXBfNDAzL3B5a2Ftc3RydXAva2Ftc3RydXAucHk=) | `51.16% <0.00%> (+37.98%)` | :arrow_up: | | [custom\_components/kamstrup\_403/sensor.py](https://codecov.io/gh/golles/ha-kamstrup_403/pull/58?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Sander#diff-Y3VzdG9tX2NvbXBvbmVudHMva2Ftc3RydXBfNDAzL3NlbnNvci5weQ==) | `94.11% <0.00%> (+43.13%)` | :arrow_up: | | [custom\_components/kamstrup\_403/\_\_init\_\_.py](https://codecov.io/gh/golles/ha-kamstrup_403/pull/58?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Sander#diff-Y3VzdG9tX2NvbXBvbmVudHMva2Ftc3RydXBfNDAzL19faW5pdF9fLnB5) | `85.00% <0.00%> (+56.25%)` | :arrow_up: | | [custom\_components/kamstrup\_403/config\_flow.py](https://codecov.io/gh/golles/ha-kamstrup_403/pull/58?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Sander#diff-Y3VzdG9tX2NvbXBvbmVudHMva2Ftc3RydXBfNDAzL2NvbmZpZ19mbG93LnB5) | `95.74% <0.00%> (+95.74%)` | :arrow_up: | 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=Sander). 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=Sander)

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