Bump version to v0.7.0

setup.py

@@ -14,7 +14,7 @@ def read(fname):
 
 setup(
     name='graphene-django-optimizer',
-    version='0.6.3',
+    version='0.7.0',
     author='Tomás Fox',
     author_email='tomas.c.fox@gmail.com',
     description='Optimize database access inside graphene queries.',