Add wither->wither, either, whether, weather, (#686)

codespell_lib/data/dictionary.txt

diff --git a/codespell_lib/data/dictionary.txt b/codespell_lib/data/dictionary.txt
index 456fe7b..799eb3f 100644
--- a/codespell_lib/data/dictionary.txt
+++ b/codespell_lib/data/dictionary.txt
@@ -13969,6 +13969,7 @@
 withdrawl->withdrawal, withdraw,
 withe->with
 witheld->withheld
+wither->wither, either, whether, weather,
 withh->with
 withih->within
 withing->within