Fix link for prerequisites (#587)

campionfellin · Ace Nassri · commit a3b5994afbeb · 2018-04-11T14:42:49.000-07:00
diff --git a/functions/helloworld/README.md b/functions/helloworld/README.md
@@ -16,7 +16,7 @@ See the [Cloud Functions Hello World tutorial][tutorial].
 
 ## Run the tests
 
-1. Read and follow the [prerequisites](../../#how-to-run-the-tests).
+1. Read and follow the [prerequisites](../../../../#prerequisites).
 
 1. Install dependencies:
 
