bump version to 0.5.0 (first Mujoco environment)

setup.cfg

@@ -1,9 +1,9 @@
 [metadata]
 name = envpool
-version = 0.4.6
+version = 0.5.0
 author = "EnvPool Contributors"
 author_email = "[email protected]"
-description = "envpool"
+description = "C++-based high-performance parallel environment execution engine (vectorized env) for general RL environments."
 long_description = file: README.md
 long_description_content_type = text/markdown
 url = https://github.com/sail-sg/envpool