Updated tk-multi-launchapp to v0.13.1

Release notes: https://github.com/shotgunsoftware/tk-multi-launchapp/wiki/Release-Notes#v0131

Author: Toolkitty

env/includes/app_locations.yml

@@ -43,7 +43,7 @@ apps.tk-multi-demo.location:
 apps.tk-multi-launchapp.location:
   type: app_store
   name: tk-multi-launchapp
-  version: v0.13.0
+  version: v0.13.1
 apps.tk-multi-loader2.location:
   type: app_store
   name: tk-multi-loader2