Increment version number

Author: sudonatalie

manifest.json

@@ -2,7 +2,7 @@
   "manifest_version": 2,
   "name": "List Layouts for Trello",
   "description": "Allow Trello lists to be displayed vertically or in a grid.",
-  "version": "3.1",
+  "version": "3.2",
   "author": "Natalie Chouinard",
   "icons": {
     "48": "icons/icon48.png",