Bump version number

Author: Cito

setup.py

@@ -22,7 +22,7 @@
 
 setup(
     name='gql',
-    version='0.3.0',
+    version='0.4.0',
     description='GraphQL client for Python',
     long_description=open('README.md').read(),
     long_description_content_type="text/markdown",