Bump Travis versions

[coveralls]

Pull Request Test Coverage Report for Build 1340

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 2839 unchanged lines in 45 files lost coverage.
• Overall coverage decreased (-7.4%) to 34.422%

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Files with Coverage Reduction	New Missed Lines	%
aws/spec/cmds_defs.go	4	100.0%
template/internal/ast/build.go	7	100.0%
aws/spec/accesskey.go	8	56.11%
cloud/lazy.go	8	20.0%
cloud/cloud.go	10	37.04%
aws/spec/securitygroup.go	11	69.53%
aws/doc/paramsdoc.go	13	100.0%
template/env.go	14	86.41%
template/params/validation.go	17	73.56%
aws/spec/images_query.go	18	45.88%
<!--	Total:	2839		-->

Totals
Change from base Build 1337:	-7.4%
Covered Lines:	13184
Relevant Lines:	38301

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💛 - Coveralls

[HaraldNordgren]

@fxaguessy @simcap Ping