Update setup.py

Author: Pytlicek

setup.py

@@ -5,7 +5,7 @@
 
 setuptools.setup(
     name="fastapi_featureflags",
-    version="0.3",
+    version="0.4",
     author="Tomas Pytel",
     author_email="pytlicek@gmail.com",
     description="Feature Flags for FastAPI",