make sure that the pre-trained galloping and trotting policies work for the minitaur_reactive_env and minitaur_trotting_env environments.

examples/pybullet/gym/pybullet_envs/minitaur/envs/README

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+This folder contains a number of simulated Minitaur environments implemented using pybullet.
+The following two environments are used in the RSS paper "Sim-to-Real: Learning Agile Locomotion For Quadruped Robots":
+1) Galloping example: minitaur_reactive_env.py
+python minitaur_reactive_env_example.py runs a pre-trained PPO agent that performs galloping gait.
+
+2) Trotting example: minitaur_trotting_env.py
+python minitaur_trotting_env_example.py runs a pre-trained PPO agent that performs trotting gait.
+
+The rest are experimental environments.
+
+