Updated tk-multi-publish2 to v2.6.8

Release notes: https://github.com/shotgunsoftware/tk-multi-publish2/wiki/Release-Notes#v268

Author: toolkitty

env/includes/common/apps.yml

@@ -35,7 +35,7 @@ common.apps.tk-multi-setframerange:
 common.apps.tk-multi-publish2.location:
   type: app_store
   name: tk-multi-publish2
-  version: v2.6.7
+  version: v2.6.8
 common.apps.tk-multi-loader2.location:
   type: app_store
   name: tk-multi-loader2
@@ -72,5 +72,5 @@ common.apps.tk-shotgun-launchvredreview.location:
   type: app_store
   name: tk-shotgun-launchvredreview
   version: v1.1.4
-common.apps.tk-multi-publish2.help_url:
+common.apps.tk-multi-publish2.help_url: 
   https://help.autodesk.com/view/SGSUB/ENU/?guid=SG_Supervisor_Artist_sa_integrations_sa_integrations_user_guide_html#the-publisher