More tox improvements
More tox improvements

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