Merge pull request #2514 from flyingdutchman23/topic/bu

Add alternative for 'bu'

Author: peternewman

codespell_lib/data/dictionary_rare.txt

@@ -16,7 +16,7 @@ bellow->below
 bloc->block
 blocs->blocks
 bodgy->body
-bu->by
+bu->by, be, but, bug, bun, bud, buy, bum,
 buss->bus
 busses->buses
 calculatable->calculable