Add a couple spelling corrections

diff --git a/codespell_lib/data/dictionary.txt b/codespell_lib/data/dictionary.txt
index a5e5e44..8247d7b 100644
--- a/codespell_lib/data/dictionary.txt
+++ b/codespell_lib/data/dictionary.txt
@@ -25896,6 +25896,8 @@
 Skagerak->Skagerrak
 skalar->scalar
 skateing->skating
+skecth->sketch
+skecthes->sketches
 skeep->skip
 skelton->skeleton
 skept->skipped