chore(travis): enable testing on 1.0.0
chore(travis): enable testing on 1.0.0

derdela/nickel.rs,BenKnigge/nickel.rs,lzpfmh/nickel.rs,nickel-org/nickel.rs,nikomatsakis/nickel.rs,anvie/nickel.rs,Ye-Yong-Chi/nickel.rs,ixjf/nickel.rs,SimonPersson/nickel.rs,jolhoeft/nickel.rs,Ryman/nickel.rs,Manishearth/nickel.rs,cburgdorf/nickel.rs,tempbottle/nickel.rs