Bump golang version to v1.13.5

[chenrui333]

Bump travis build config to use latest golang.

We have already shipped this in Homebrew v0.14.3 (Homebrew/homebrew-core#47394)

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[chenrui333]

/cc @davidmccormick

[codecov-io]

Codecov Report

Merging #1820 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #1820   +/-   ##
======================================
  Coverage    24.6%   24.6%           
======================================
  Files          98      98           
  Lines        5069    5069           
======================================
  Hits         1247    1247           
  Misses       3682    3682           
  Partials      140     140

---

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[davidmccormick]

Many thanks for this contribution! 🙏