Fix flake8 issues in field example

Author: amitsaha

examples/field_example.py

@@ -1,12 +1,15 @@
 import graphene
 
+
 class Person(graphene.Interface):
     name = graphene.String()
     age = graphene.ID()
 
+
 class Patron(Person):
     id = graphene.ID()
 
+
 class Query(graphene.ObjectType):
 
     patron = graphene.Field(Patron)
@@ -26,5 +29,3 @@ def resolve_patron(self, args, info):
 result = schema.execute(query)
 # Print the result
 print result.data['patron']
-
-