Update version and release date.

Author: Davit Barbakadze

package.json

@@ -15,8 +15,8 @@
         "Silverlight",
         "moxie"
     ],
-    "version": "2.3.0",
-    "releaseDate": "2017-02-02",
+    "version": "2.3.1",
+    "releaseDate": "2017-02-06",
     "author": "Ephox",
     "contributors": [{
         "name": "Davit Barbakadze",