Description for mix test --seed option

Signed-off-by: José Valim <[email protected]>

Author: couchemar

lib/mix/lib/mix/tasks/test.ex

@@ -47,6 +47,7 @@ defmodule Mix.Tasks.Test do
   * `--include` - include tests that match the filter
   * `--exclude` - exclude tests that match the filter
   * `--only` - run only tests that match the filter
+  * `--seed` - seeds the random number generator used to randomize tests order
 
   ## Filters