Use go 1.9.2 in travis ci builds, fixes #20

[stiangrindvoll]

No description provided.

[codecov-io]

Codecov Report

Merging #23 into master will decrease coverage by 2.15%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #23      +/-   ##
==========================================
- Coverage   51.48%   49.32%   -2.16%     
==========================================
  Files           8        8              
  Lines         606      744     +138     
==========================================
+ Hits          312      367      +55     
- Misses        254      337      +83     
  Partials       40       40

Impacted Files	Coverage Δ
client.go	70.42% <0%> (-5.85%)	⬇️
util.go	80.95% <0%> (-3.96%)	⬇️
daemon.go	59.64% <0%> (-3.4%)	⬇️
marathon.go	80.95% <0%> (-3.05%)	⬇️
box.go	60.16% <0%> (-2.34%)	⬇️
main.go	0% <0%> (ø)	⬆️
kms.go	24.13% <0%> (ø)	⬆️
commands.go	81.81% <0%> (+1.81%)	⬆️

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