update info

docs/source/tutorials/ReadMe.md

@@ -19,12 +19,16 @@ You can then remove it with:
 jupyter kernelspec uninstall myosuite
 ```
 
+You might need also to install ffmpeg to write videos to play them back in the notebooks. You can do it with
+``` bash
+conda install conda-forge::ffmpeg
+```
+
 ## Tutorials
 
 - [Get Started](./1_Get_Started.ipynb)
 - [Load a trained policy and play it](./2_Load_policy.ipynb) *
 - [Analyse movements from a trained policy](./3_Analyse_movements.ipynb) *
-- [Train a new policy with MJRL](./4_Train_policy.ipynb). *
 - [Use the DEPRL baseline](./4a_deprl.ipynb). For this tutorial, `deprl` is needed. You can install it with `pip install deprl`
 - [Use the MyoReflex baseline](./4b_reflex/MyoSuite_MyoReflex_Walk.ipynb). For this tutorial, we provided a wrapper to use MyoReflex together with the tutorial file
 - [Train a new policy with stable baselines (SB)](./4c_Train_SB_policy.ipynb). For this tutorial, `stable-baselines3` is needed. You can install it with `pip install stable-baselines`
@@ -33,4 +37,4 @@ jupyter kernelspec uninstall myosuite
 - [Replicate hand movements with inverse dynamics](./6_Inverse_Dynamics.ipynb). For this tutorial, `osqp`, `matplotlib` and `pandas` are needed. You can install it with `pip install osqp matplotlib pandas`
 - [Fatigue Modeling](./7_Fatigue_Modeling.ipynb)
 
-*For those tutorial, `mjrl` and `mujoco_py` are needed. You can install them with `pip install tabulate matplotlib torch free-mujoco-py git+https://github.com/aravindr93/mjrl.git`
+*For those tutorial, `mjrl` and `gym==0.13` are needed. You can install them with `pip install tabulate matplotlib torch gym==0.13 git+https://github.com/aravindr93/mjrl.git@pvr_beta_1vk`