Add Go 1.10 to the Travis build matrix

[cce]

No description provided.

[jiwen624]

Looks good.

[jiwen624]

Seems we're hitting on this issue: travis-ci/travis-ci#9247

[jiwen624]

One comment: if 1.10 is added, should we remove 1.7 as to supporting only the latest 3 releases?

[cheempz]

Re:

One comment: if 1.10 is added, should we remove 1.7 as to supporting only the latest 3 releases?

Makes sense to me since golang's release policy would make 1.7 already not supported.

[codecov-io]

Codecov Report

Merging #41 into master will decrease coverage by 0.23%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #41      +/-   ##
==========================================
- Coverage   83.19%   82.95%   -0.24%     
==========================================
  Files          32       32              
  Lines        2927     2927              
==========================================
- Hits         2435     2428       -7     
- Misses        429      435       +6     
- Partials       63       64       +1

Impacted Files	Coverage Δ
v1/ao/internal/host/observer.go	81.59% <0%> (-5.61%)	⬇️

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