docs: update contribute link

KingDarBoja · KingDarBoja · commit 2f627ed4028f · 2020-08-07T12:18:55.000-05:00
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
diff --git a/MANIFEST.in b/MANIFEST.in
@@ -1,6 +1,5 @@
 include LICENSE
 include README.md
-include CONTRIBUTING.md
 
 include tox.ini
 include Makefile
diff --git a/README.md b/README.md
@@ -85,4 +85,4 @@ class UserRootValue(GraphQLView):
 ```
 
 ## Contributing
-See [CONTRIBUTING.md](CONTRIBUTING.md)
+Since v3, `flask-graphql` code lives at [graphql-server](https://github.com/graphql-python/graphql-server) repository to keep any breaking change on the base package on sync with all other integrations. In order to contribute, please take a look at [CONTRIBUTING.md](https://github.com/graphql-python/graphql-server/blob/master/CONTRIBUTING.md).
