0.4.3

What's Changed

• Re-add support for Python 3.9, as it still receives security updates by @kipe in #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: 0.4.2...0.4.3