Convert to use poetry & pyproject.toml for dep & build management (#54)

* 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

kasa/cli.py

@@ -7,6 +7,7 @@ from pprint import pformat as pf
 from typing import cast
 
 import asyncclick as click
+
 from kasa import Discover, SmartBulb, SmartDevice, SmartPlug, SmartStrip
 
 click.anyio_backend = "asyncio"