Pytibber

What's Changed
* sub_manager by Danielhiversen in https://github.com/Danielhiversen/pyTibber/pull/129
* 3.10 by Danielhiversen in https://github.com/Danielhiversen/pyTibber/pull/130
* user_agent by Danielhiversen in https://github.com/Danielhiversen/pyTibber/pull/133
* order liveMeasurement by Danielhiversen in https://github.com/Danielhiversen/pyTibber/pull/135
* Remove deprecated async-timeout synchronous context manager usage by Danielhiversen in https://github.com/Danielhiversen/pyTibber/pull/134


**Full Changelog**: https://github.com/Danielhiversen/pyTibber/compare/0.20.0...0.21.0

What’s Changed
* Add accumulatedReward (117) Danielhiversen

What’s Changed
* Add powerFactor powerReactive (116) Danielhiversen
* Update README.md (115) Danielhiversen
* Danielhiversen patch 1 (114) Danielhiversen
* Create rebase.yml (113) Danielhiversen
* Py39 (112) Danielhiversen