Setting version back to 1.9.0pre.

package.json

@@ -2,7 +2,7 @@
   "name": "jquery-ui",
   "title": "jQuery UI",
   "description": "Abstractions for low-level interaction and animation, advanced effects and high-level, themeable widgets, built on top of the jQuery JavaScript Library, that you can use to build highly interactive web applications.",
-  "version": "1.9.0-beta.1",
+  "version": "1.9.0pre",
   "homepage": "https://github.com/jquery/jquery-ui",
   "author": {
     "name": "AUTHORS.txt"