Fix for msgpack on 3
Fix for msgpack on 3

mathom/kombu,bmbouter/kombu,bmbouter/kombu,alex/kombu,urbn/kombu,ZoranPavlovic/kombu,andresriancho/kombu,mverrilli/kombu,iris-edu-int/kombu,numb3r3/kombu,jindongh/kombu,andresriancho/kombu,mverrilli/kombu,numb3r3/kombu,daevaorn/kombu,xujun10110/kombu,tkanemoto/kombu,Elastica/kombu,cce/kombu,mathom/kombu,celery/kombu,daevaorn/kombu,xujun10110/kombu,jindongh/kombu,iris-edu-int/kombu,cce/kombu,romank0/kombu,alex/kombu,ZoranPavlovic/kombu,Elastica/kombu,romank0/kombu,tkanemoto/kombu