addititional->additional

Typo found in the Converse.js XMPP client:
conversejs/converse.js#3836

Author: linkmauve

codespell_lib/data/dictionary.txt

@@ -1961,6 +1961,7 @@ additionalyy->additionally
 additionnal->additional
 additionnally->additionally
 additionnaly->additionally
+addititional->additional
 additivies->additives
 additivley->additively, additive,
 additoin->addition