Add obtrain{ed}->obtain{ed} (#681)

codespell_lib/data/dictionary.txt

diff --git a/codespell_lib/data/dictionary.txt b/codespell_lib/data/dictionary.txt
index 11a1e54..e569697 100644
--- a/codespell_lib/data/dictionary.txt
+++ b/codespell_lib/data/dictionary.txt
@@ -8698,6 +8698,8 @@
 obsure->obscure
 obtaiend->obtained
 obtaion->obtain
+obtrain->obtain
+obtrained->obtained
 obyect->object
 obyekt->object
 ocasion->occasion