Updated master branch travis-ci build stats badge
Updated master branch travis-ci build stats badge

This should always point to master

randym/axlsx,woto/axlsx,bradstewart/axlsx,mromulus/axlsx,clarkcutler/axlsx,raghavendra-prithvi/axlsx,Debiancc/axlsx,romuloceccon/axlsx,VueOps/axlsx,kappiah/axlsx,pedrogarrett/axlsx,sh-ft/axlsx,sr-education/axlsx,legitscript/axlsx,alexanderfrankel/axlsx