Updated tk-maya to v0.11.8

Release notes: https://github.com/shotgunsoftware/tk-maya/wiki/Release-Notes#v0118

Author: toolkitty

env/includes/common/engines.yml

@@ -27,7 +27,7 @@ common.engines.tk-houdini.location:
 common.engines.tk-maya.location:
   type: app_store
   name: tk-maya
-  version: v0.11.7
+  version: v0.11.8
 common.engines.tk-nuke.location:
   type: app_store
   name: tk-nuke