Updated pattern-upgrading page

This is part of pattern-lab/patternlab-node#70 for version 1.0.0 release prep

Author: bmuenzenmeyer

patternlabsite/docs/upgrading.md

@@ -64,25 +64,20 @@ If you want to you can clean-up some of the directories that are left-over after
 
 To upgrade the Node version of Pattern Lab do the following:
 
-1. **Important:** Make a back-up of `source/` and `config.json` and your `Gruntfile`|`Gulpfile`. 
+1. **Important:** Make a back-up of `source/` and `config.json` and your `Gruntfile`|`Gulpfile`.
 2. [Download the latest release](https://github.com/pattern-lab/patternlab-node/releases) of the Node version of Pattern Lab, or use `npm update patternlab-node` if you originally [installed](/docs/node/installation.html) Pattern Lab via `npm.`
 3. Restore files in `source/` and `config.json` if needed.
-4. Be mindful of whether you need to merge any customizations to `config.json` or your `Gruntfile`|`Gulpfile` 
+4. Be mindful of whether you need to merge any customizations to `config.json` or your `Gruntfile`|`Gulpfile`
 
 If you encounter trouble - make sure your npm devDependencies are up to date. Assuming you have the latest `package.json` file, you can delete the contents of `./node_modules` and run `npm cache clear` before running `npm install` to pull down everything anew.
 
 ###### Addendum:
 
-* Upgrading to [v0.12.0](https://github.com/pattern-lab/patternlab-node/releases/tag/v0.12.0) requires overwriting: `source/_patternlab-files/partials/ishControls.mustache`
-* Upgrading to [v0.10.X or v0.11.0](https://github.com/pattern-lab/patternlab-node/releases/tag/v0.11.0) requires: 
-  * Add `"baseurl" : ""` to `config.json`
-  * Overwrite `source/_patternlab-files/pattern-header-footer/footer.html`
-  * Overwrite `source/_patternlab-files/styleguide.mustache`
-  * Overwrite `source/_patternlab-files/viewall.mustache`
-  
+Some releases require a little extra file rearranging or reconfiguration. Please check the [addenda](https://github.com/pattern-lab/patternlab-node/wiki/Upgrading) on the wiki for more info.
+
 {% endcapture %}
 {{ m | markdownify }}
 
 </div>
-  
-<!--- end node -->
+
+<!--- end node -->