import type for this flow type

Author: leebyron

src/type/schema.js

@@ -9,15 +9,14 @@
  */
 
 import {
-  GraphQLAbstractType,
   GraphQLObjectType,
   GraphQLInputObjectType,
   GraphQLInterfaceType,
   GraphQLUnionType,
   GraphQLList,
   GraphQLNonNull
 } from './definition';
-import type { GraphQLType } from './definition';
+import type { GraphQLType, GraphQLAbstractType } from './definition';
 import {
   GraphQLDirective,
   GraphQLIncludeDirective,