chore: sort imports on graphqlview

Author: KingDarBoja

flask_graphql/graphqlview.py

@@ -2,12 +2,12 @@
 
 from flask import Response, request
 from flask.views import View
-
-from graphql.type.schema import GraphQLSchema
 from graphql_server import (HttpQueryError, default_format_error,
                             encode_execution_results, json_encode,
                             load_json_body, run_http_query)
 
+from graphql.type.schema import GraphQLSchema
+
 from .render_graphiql import render_graphiql