Update index.html.js (graphql#402)

Added GQL. A GraphQL client in Python.

Author: pyojo

site/code/index.html.js

@@ -395,6 +395,7 @@ Executor.execute(schema, query) map println
 - [Java / Android](#java-android)
 - [JavaScript](#javascript-1)
 - [Swift / Objective-C iOS](#swift-objective-c-ios)
+- [Python](#python-1)
 
 ### C# / .NET
 
@@ -421,6 +422,10 @@ Executor.execute(schema, query) map println
   - [Apollo iOS](https://www.apollographql.com/docs/ios/) ([github](https://github.com/apollographql/apollo-ios)): A GraphQL client for iOS that returns results as query-specific Swift types, and integrates with Xcode to show your Swift source and GraphQL side by side, with inline validation errors.
   - [GraphQL iOS](https://github.com/funcompany/graphql-ios): An Objective-C GraphQL client for iOS.
 
+### Python
+
+  - [GQL](https://github.com/graphql-python/gql): A GraphQL client in Python.
+
 ## Tools
 
   - [graphiql](https://github.com/graphql/graphiql) ([npm](https://www.npmjs.com/package/graphiql)): An interactive in-browser GraphQL IDE.