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Bump Travis versions

Signed-off-by: Harald Nordgren <e5132763ea37cf5d97f1701090748f77cd228a9a@gmail.com>

laijs/runc,mYmNeo/runc,estesp/runc,opencontainers/runc,mheon/runc,justincormack/runc,mikebrow/runc,opencontainers/runc,adrianreber/runc,justincormack/runc,mikebrow/runc,crosbymichael/runc,laijs/runc,rhatdan/runc,dqminh/runc,opencontainers/runc,xiaochenshen/runc,rhatdan/runc,laijs/runc,estesp/runc,kolyshkin/runc,adrianreber/runc,crosbymichael/runc,opencontainers/runc,kolyshkin/runc,dqminh/runc,estesp/runc,dqminh/runc,rhatdan/runc,kolyshkin/runc,mheon/runc,xiaochenshen/runc,xiaochenshen/runc,mikebrow/runc,adrianreber/runc,dqminh/runc,mYmNeo/runc,mYmNeo/runc,justincormack/runc,kolyshkin/runc,mheon/runc,rhatdan/runc,crosbymichael/runc