Update README.md

Maybe this is obvious, but it took me awhile to realize this, so I thought it might help future users.
NARKOZ · May 23, 2014 · d0205d1 · d0205d1
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diff --git a/README.md b/README.md
@@ -34,6 +34,8 @@ Gitlab.configure do |config|
 end
 ```
 
+(Note: If you are using Gitlab.com's hosted service, your endpoint will be `https://gitlab.com/api/v3`)
+
 Usage examples:
 
 ```ruby