e4bc9e36c967a8db99affbe39d9f1144b25b6769 New: sort option for `-but…

…ton colvis` which can be set to be `alphabetic` to have the buttons shown in the dropdown sort alphabetically.

Sync to source repo @e4bc9e36c967a8db99affbe39d9f1144b25b6769

datatables.json

@@ -14,5 +14,5 @@
     ],
     "src-repo": "http://github.com/DataTables/Buttons",
     "last-tag": "3.1.2",
-    "last-sync": "4013447fd9b542203cf0e082835fa200fe558c65"
+    "last-sync": "e4bc9e36c967a8db99affbe39d9f1144b25b6769"
 }