updated the instructions to point to the wiki for now

Author: bmuenzenmeyer

README.md

@@ -49,7 +49,7 @@ It's not expected to toggle between the two build systems, but for those migrati
 
 ### Upgrading
 
-You can find some simple upgrade documenation in it's current home here (unreleased but confirmed to work): [https://github.com/pattern-lab/website/blob/dev/patternlabsite/docs/node/upgrading.md](https://github.com/pattern-lab/website/blob/dev/patternlabsite/docs/node/upgrading.md)
+You can find instructions on how to upgrade from version to version of Pattern Lab Node here: [https://github.com/pattern-lab/patternlab-node/wiki/Upgrading](https://github.com/pattern-lab/patternlab-node/wiki/Upgrading)
 
 ### Command Line Interface