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• introduced support for a new RL library, stable-baselines: https://github.com/hill-a/stable-baselines
• removed and deprecated all rllab features
• introduced a multi-lane generic highway network with on- and off-ramps
• added a tutorial on running the bottleneck experiments
• added a tutorial for running RLlib experiments on EC2 servers
• some refactoring to features in grid network
• increased unit test coverage for renderer features

• upgraded to sumo 1.1.0, see PR #293
• new router class, see PR #524
• updated documentation for most methods and classes

This is the final release before we are switching to a more recent version of SUMO. Some changes include:

• Cleanup to many of the scripts from redundant or unsed pieces of code.
• Modifications to aimsun functionality and inclusion of an aimsun scripting class.
• Extended unit test coverage. Our coverage is now about 90%.
• Tutorials on using OpenStreetMap and Network Template scenarios.
• Updated behavior to some of the examples and benchmarks to be compatible with the newer version of SUMO.

• support for a new traffic simulator: Aimsun
• simulator specific commands were abstracted and moved from the environments to a kernel class, consisting of simulation, scenario, vehicle, and traffic_light subkernels. The subkernels were implemented for SUMO and Aimsun, and further ones can be created to support a plethora of other traffic simulators