Prepare for 0.5.0 release (#88)

Author: vwxyzjn

.github/workflows/pypi.yaml

@@ -3,6 +3,7 @@ name = "cleanrl"
 version = "0.5.0"
 description = "High-quality single file implementation of Deep Reinforcement Learning algorithms with research-friendly features"
 authors = ["Costa Huang <[email protected]>"]
+include = ["cleanrl_utils"]
 
 [tool.poetry.dependencies]
 python = ">=3.7.1,<3.10"