Bug 1267325 - Add outlier, outliers and outlier's to the en-US dictionary. r=ehsan

extensions/spellcheck/locales/en-US/hunspell/en-US.dic

@@ -1,4 +1,4 @@
-52345
+52346
 0/nm
 0th/pt
 1/n1
@@ -37486,6 +37486,7 @@ outlast/DSG
 outlaw/SGMD
 outlay/SGM
 outlet/SM
+outlier/SM
 outline/MGDS
 outlive/GDS
 outlook/MS