Use new TimeoutError

lib/time.js

@@ -140,7 +140,7 @@ function timeoutPromise (timeout) {
     // if no timeout is specified, never settle
     if (!timeout) return
 
-    setTimeout(() => reject(new Error(`timeout after ${timeout / 1000}s`)), timeout)
+    setTimeout(() => reject(new TimeoutError(timeout)), timeout)
   })
 }