Nordpool

What's Changed
* Re-add support for Python 3.9, as it still receives security updates by kipe in https://github.com/kipe/nordpool/pull/54
* Removes Elbas, as it has been broken for quite a while
* Adds `__version__` for checking the library version. Usage: `python3 -c "import nordpool; print(nordpool.__version__)"`
* Re-adds Coveralls for reporting test coverage

**Full Changelog**: https://github.com/kipe/nordpool/compare/0.4.2...0.4.3

What's Changed
* API returns 204 when no data is available by jschlyter in https://github.com/kipe/nordpool/pull/43
* Use correct currency when fetching prices by jschlyter in https://github.com/kipe/nordpool/pull/45
* Add tests for currency change and prices being not available by kipe in https://github.com/kipe/nordpool/pull/47
* Update installation instructions to use PyPi by kipe in https://github.com/kipe/nordpool/pull/48


**Full Changelog**: https://github.com/kipe/nordpool/compare/0.4.1...0.4.2

What's Changed
* Bugfix to accidental data format change in 0.4.0 by kipe in https://github.com/kipe/nordpool/pull/40


**Full Changelog**: https://github.com/kipe/nordpool/compare/0.4.0...0.4.1

What's Changed
* Fix price fetching by kipe in https://github.com/kipe/nordpool/pull/37
* Switches to use poetry and adds tests

**Full Changelog**: https://github.com/kipe/nordpool/compare/0.3.3...0.4.0

- Updated split of r['name'] 24
- Added timeout param to Prices 23

- Raise exception if returned currency doesn't match the requested