Update README.md (#177)

* Update README.md

Python 3.8+ is misleading.

* Also change the docs

Co-authored-by: Costa Huang <costa.huang@outlook.com>

Author: ElliotMunro200

README.md

@@ -31,7 +31,7 @@ Good luck have fun :rocket:
 ## Get started
 
 Prerequisites:
-* Python 3.8+
+* Python 3.8-3.9 (not yet 3.10)
 * [Poetry](https://python-poetry.org)
 
 To run experiments locally, give the following a try:
@@ -148,4 +148,4 @@ If you use CleanRL in your work, please cite our technical [paper](https://arxiv
     archivePrefix={arXiv},
     primaryClass={cs.LG}
 }
-```
+```

docs/get-started/installation.md

@@ -2,7 +2,7 @@
 
 ## Prerequisites
 
-* Python 3.8+
+* Python 3.8-3.9 (not yet 3.10)
 * [Poetry](https://python-poetry.org)
 
 Simply run the following command for a quick start