Bump version to 0.3

Author: kaedroho

setup.py

@@ -15,7 +15,7 @@
 
 setup(
     name="wagtail-ab-testing",
-    version="0.3rc1",
+    version="0.3",
     description="A/B Testing for Wagtail",
     author="Karl Hobley",
     author_email="[email protected]",