* Convert to use poetry and pyproject.toml, update README
* add some resources for contributors
* minor adjustments
* ci: separate tests from linting, run using poetry
* add pytest-mock to dev requirements
* combine running tests and reporting to codecov
* generate both xml and html coverage reports
* add codecov to dev dependencies
* Move dimmer support to its own class
SmartDimmer extends SmartPlug with brightness settings.
This will make the API of SmartPlug less confusing and will
make it simpler to downstream users to act with dimmers.
Fixes#33
* Lint & make tests pass
* Fix rebase after cache and emeter cleanups, hopefully everything went smoothly..
* oopsie, has_emeter was mistakenly included in smartplug
