dict: add appropriatness->appropriateness

Google search shows 41,000 results for appropriatness, that's 0.34%
of the results shown for appropriateness (11,900,000).

data/dictionary.txt

diff --git a/data/dictionary.txt b/data/dictionary.txt
index c742b88..dde9e2b 100644
--- a/data/dictionary.txt
+++ b/data/dictionary.txt
@@ -337,6 +337,7 @@
 appropiately->appropriately
 appropraite->appropriate
 appropraitely->appropriately
+appropriatness->appropriateness
 appropropiate->appropriate
 appropropiately->appropriately
 approproximate->approximate