SUMO-RL 1.4.2 Release

What's Changed

• Support for custom observations (both observation function and observation space) by @firemankoxd in #133
• Updated pydocs
• Added pre-commit, black and isort to the code
• Documentation updated
• Renamed "run" to "episode" on the output .csv file

Bug fix

• Fixed "pressure" reward function sign

Full Changelog: v1.4.1...v1.4.2