Update CHANGELOG.md

[rysiulg]

duplicated register 4 defined as sensor and number. Removed from sensor config

;) -I've implemented in my branch: https://github.com/rysiulg/Midea-heat-pump-ESPHome/tree/master-york-with-automations in version numbering when creating version automatically change version in heatpump.yaml and changelog.md and also prepare and add lines defined new changes like [Unreleased] and next line changed -this is for convinient purpose and easly create versions, also you don't forget to add these lines after create new version or just before create version.
Why waste place in our memoriy? ;)

[Mosibi]

@rysiulg instead of creating a new pull request, can you update the changelog in the already existing pull request.

btw I want to keep everything as simple as possible, so also add the unreleased tag manual, I do not want to automate that