linting: added two lines after end of class

Author: anisjonischkeit

graphene/types/datetime.py

@@ -43,6 +43,7 @@ def parse_value(value):
         except iso8601.ParseError:
             return None
 
+
 class DateTime(Scalar):
     '''
     The `DateTime` scalar type represents a DateTime
@@ -69,6 +70,7 @@ def parse_value(value):
         except iso8601.ParseError:
             return None
 
+
 class Time(Scalar):
     '''
     The `Time` scalar type represents a Time value as