Update tutorial.md

Bluehouse-Technology · Nov 30, 2017 · 02e8878 · 02e8878
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@@ -813,7 +813,7 @@ metadata can be added using `grpc:set_headers/2` or `grpc:set_trailers/2`.
 
 ## Server Middleware
 
-You can implement middleware as described in https://ninenines.eu/docs/en/cowboy/1.0/guide/middlewares/. The list of middlewares will need to be specified in order of execution in the `middlewares` option when starting the server. The list must include `cowboy_router` and `cowboy_handler`.
+You can implement middleware as described in https://ninenines.eu/docs/en/cowboy/2.0/guide/middlewares/. The list of middlewares will need to be specified in order of execution in the `middlewares` option when starting the server. The list must include `cowboy_router` and `cowboy_handler`.
 
 TODO: 
 -  Timeout.