chore: bumping version to 1.3.8

Merge pull request #153 from iprak/raise_HomeAssistantError

test: fix failing tests

fix: raise HomeAssistantError when prepararing devices

fix: raise HomeAssistantError for operations

chore: bumping version to 1.3.7

Merge pull request #149 from iprak/define_custom_icon

fix: use custom air-purifier icon

chore: bumping version to 1.3.6

Merge pull request #147 from iprak/update_brightness_on_change

doc: add explanation about brightess level

fix: improve integration with brightness selection

fix: only allow brightness selection when running

fix: write change brightness on change

chore: bumping version to 1.3.5