Cartpole angular_center_resolution and angular_outer_resolution in radians

[MuhammadSYahyaS]

Looking into cartpole_model.py:L45, the angle_range is defined in radians. Also, how the physics is simulated for calculating new velocity and new angular velocity are also using radians sin and cos functions.

However, the default parameter of angular_center_resolution=.1 and angular_outer_resolution=.5 made me perceiving it as in degrees, which can be a major issue.