Add spelling correction for gather and variants.

codespell_lib/data/dictionary.txt

diff --git a/codespell_lib/data/dictionary.txt b/codespell_lib/data/dictionary.txt
index f40d7b6..baf35fa 100644
--- a/codespell_lib/data/dictionary.txt
+++ b/codespell_lib/data/dictionary.txt
@@ -29741,6 +29741,10 @@
 gateing->gating
 gatherig->gathering
 gatherin->gathering, gather in,
+gathter->gather
+gathtered->gathered
+gathtering->gathering
+gathters->gathers
 gatin->gating, latin, satin, gain, gratin,
 gatway->gateway
 gauage->gauge