Add a couple of spelling corrections (#387)

diff --git a/codespell_lib/data/dictionary.txt b/codespell_lib/data/dictionary.txt
index bf67f2a..b98c5e9 100644
--- a/codespell_lib/data/dictionary.txt
+++ b/codespell_lib/data/dictionary.txt
@@ -8510,7 +8510,9 @@
 thign->thing
 thigns->things
 thigsn->things
+thik->thick, think,
 thikn->think
+thikness->thickness
 thikning->thinking, thickening,
 thikns->thinks
 this this->this, this is, is this,