Increase version to 0.5.1

Author: maxencefaldor

README.md

@@ -25,12 +25,12 @@ You will need Python 3.11 or later, and a working JAX installation installed in
 
 Then, install QDax from PyPi with uv:
 ```bash
-uv pip install cax
+uv pip install QDax
 ```
 
 or with `pip`:
 ```bash
-pip install cax
+pip install QDax
 ```
 
 ### Build the documentation

qdax/__init__.py

@@ -1 +1 @@
-__version__ = "0.5.0"
+__version__ = "0.5.1"