more on bootstrap upgrade

composer.json

@@ -82,7 +82,7 @@
         "bower-asset/jquery.inputmask": "3.1.*",
         "bower-asset/punycode": "1.3.*",
         "bower-asset/yii2-pjax": "2.0.*",
-        "bower-asset/bootstrap": "3.2.* | 3.1.*",
+        "bower-asset/bootstrap": "3.3.* | 3.2.* | 3.1.*",
         "bower-asset/jquery-ui": "1.11.*@stable",
         "bower-asset/typeahead.js": "0.10.*"
     },

framework/UPGRADE.md

@@ -11,8 +11,9 @@ for both A and B.
 Upgrade from Yii 2.0.0
 ----------------------
 
-* Upgraded Twitter Bootstrap to version 3.3.x. If you need to use an older version (i.e. stick with 3.2.x) you can
-  specify that in your `composer.json` by adding the following line in the `require` section:
+* Upgraded Twitter Bootstrap to [version 3.3.x](http://blog.getbootstrap.com/2014/10/29/bootstrap-3-3-0-released/).
+  If you need to use an older version (i.e. stick with 3.2.x) you can specify that in your `composer.json` by
+  adding the following line in the `require` section:
   
   ```json
   "bower-asset/bootstrap": "3.2.*",