Add spelling correction for mitigate and variants.

codespell_lib/data/dictionary.txt

diff --git a/codespell_lib/data/dictionary.txt b/codespell_lib/data/dictionary.txt
index f4073c7..c0616b9 100644
--- a/codespell_lib/data/dictionary.txt
+++ b/codespell_lib/data/dictionary.txt
@@ -38511,6 +38511,12 @@
 mige->midge
 miges->midges
 migh->might
+migitate->mitigate
+migitated->mitigated
+migitates->mitigates
+migitating->mitigating
+migitation->mitigation
+migitations->mitigations
 migrateable->migratable
 migratin->migrating, migration,
 migt->might, midget,