Narrow mujoco-py constraint

[ryanjulian]

#1996 removed the >=2.0 constraint, which is important.

[codecov]

Codecov Report

Merging #1998 into master will increase coverage by 9.61%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1998      +/-   ##
==========================================
+ Coverage   83.92%   93.53%   +9.61%     
==========================================
  Files         190      190              
  Lines       10165    10165              
  Branches     1266     1266              
==========================================
+ Hits         8531     9508     +977     
+ Misses       1409      427     -982     
- Partials      225      230       +5     

Impacted Files	Coverage Δ
src/garage/sampler/multiprocessing_sampler.py	90.60% <0.00%> (ø)
src/garage/_functions.py	100.00% <0.00%> (+0.97%)	⬆️
src/garage/envs/gym_env.py	97.52% <0.00%> (+1.65%)	⬆️
src/garage/torch/modules/gaussian_mlp_module.py	89.01% <0.00%> (+2.19%)	⬆️
src/garage/experiment/local_runner.py	91.03% <0.00%> (+2.83%)	⬆️
src/garage/torch/_functions.py	96.59% <0.00%> (+4.54%)	⬆️
src/garage/experiment/meta_evaluator.py	87.80% <0.00%> (+4.87%)	⬆️
src/garage/_environment.py	97.36% <0.00%> (+5.26%)	⬆️
src/garage/torch/policies/policy.py	100.00% <0.00%> (+6.25%)	⬆️
src/garage/np/optimizers/minibatch_dataset.py	89.28% <0.00%> (+7.14%)	⬆️
... and 32 more

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