Remove 1.8.6 (unsupported) from Travis
Remove 1.8.6 (unsupported) from Travis

tim-vandecasteele/liquid,ipmobiletech/Shopify-liquid,Tiger66639/liquid,insales/liquid,livingsocial/liquid,tdg5/liquid,Wirachmat/liquid,sideci-sample/sideci-sample-liquid,bettyblocks/liquid,bibio/liquid,boobooninja/liquid,beni55/liquid,siteleaf/liquid,nickpearson/liquid,djreimer/liquid,evulse/liquid,pheen/liquid,locomotivecms/liquid,knu/liquid,mcary/liquid,SOFTPOWER1991/liquid,bluerail/liquid,ilovezy/liquid,Richardphp/liquid,howkj1/liquid,Shopify/liquid,illMadeKnight/liquid-1,mrmanc/liquid,zhangkuaiji/liquid,xiaoliw7/liquid,PMArtz92/liquid,lastobelus/liquid,vietlq/liquid