1.0.6: Fix rendering bugs and upgrade to MuJoCo 2.2.2

Bump version number to 1.0.6.

PiperOrigin-RevId: 472678116
Change-Id: I754ae8817c41bebbaab41c5e439dfd1d6518a822

1.0.5: Speed up warning checks

In commit ac6d2cd, we sped up the warning checks that occur at each physics step. Since these checks are called very often, the performance boost can be considerable in many use cases.

1.0.4: Accept the same values of `MUJOCO_GL` as the `mujoco` package.

The `mujoco` package also makes use of the `MUJOCO_GL` environment variable to switch between rendering backends, which are implemented separately from the ones currently used in `dm_control`. However, `mujoco` accepts a wider range of `MUJOCO_GL` values, in particular it allows `off` to be specified to disable rendering entirely.

Before this change, specifying `MUJOCO_GL=off` will result in `dm_control` complaining that it is an invalid value. This change eliminates the conflicting `MUJOCO_GL` values expected by the two libraries.

Fixes #324.

PiperOrigin-RevId: 461577872
Change-Id: Ie962040395b766affc8342ab9d9fd09a0afe15cb

1.0.3.post1: Increase `protobuf` version in setup.py.

This release is identical to 1.0.3 other than in setup.py.

1.0.3

Bump dm_control version number to 1.0.3.

PiperOrigin-RevId: 449725211
Change-Id: Iee30cfc1530d1e43e034c9aff9b6cf9aa34ef39c

1.0.2

Bump dm_control version to 1.0.2.

PiperOrigin-RevId: 441527665
Change-Id: I05d7261f3e531f4d100154baeedc568c303c2ac6

1.0.1

Update mujoco requirement to version 2.1.3.

PiperOrigin-RevId: 436776327
Change-Id: I45e84899d1c715d265f4a895097e69ba093e2088

1.0.0

Add fluidshape and fluidcoef to schema.xml

PiperOrigin-RevId: 433707901
Change-Id: Id30bb6372b69fee20379a66e8f929549821a30dd