Add python 3.9 support

Author: MDUYN

pyproject.toml

@@ -8,7 +8,7 @@ exclude = ["tests", "static", "examples", "docs"]
 
 
 [tool.poetry.dependencies]
-python = ">=3.10"
+python = ">=3.9"
 wrapt = "^1.16.0"
 Flask = "^2.3.2"
 Flask-Migrate = "^2.6.0"