test: run test on node 10

[fengmk2]

No description provided.

[codecov]

Codecov Report

Merging #63 into master will decrease coverage by 1.76%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #63      +/-   ##
==========================================
- Coverage   93.28%   91.51%   -1.77%     
==========================================
  Files           4        4              
  Lines         283      283              
==========================================
- Hits          264      259       -5     
- Misses         19       24       +5

Impacted Files	Coverage Δ
lib/_http_agent.js	89.85% <0%> (-2.42%)	⬇️

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