Bumping to version 2.2.3 in an attempt to fix npm install.

npm install is failing with "npm ERR! cb() never called".
I'm trying again from scratch.
diff --git a/package.json b/package.json
index 361c316..2fda726 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "material-design-icons",
-  "version": "2.2.2",
+  "version": "2.2.3",
   "description": "Material Design icons by Google",
   "main": "index.js",
   "repository": {