fix issue in pybullet_envs.agents

bump up to pybullet 1.6.9

examples/pybullet/gym/pybullet_envs/agents/__init__.py

@@ -20,4 +20,4 @@ from __future__ import print_function
 
 from . import train_ppo
 from . import utility
-from . import visualize
+from . import visualize_ppo

examples/pybullet/gym/pybullet_envs/agents/configs.py

@@ -119,6 +119,15 @@ def pybullet_racecar():
   return locals()
 
 
+def pybullet_humanoid():
+  locals().update(default())
+  randomizer = (minitaur_env_randomizer.MinitaurEnvRandomizer())
+  env = 'HumanoidBulletEnv-v0'
+  max_length = 1000
+  steps = 3e7  # 30M
+  return locals()
+
+
 def pybullet_minitaur():
   """Configuration specific to minitaur_gym_env.MinitaurBulletEnv class."""
   locals().update(default())