test(coverage): improve in Node 6

[ybiquitous]

No description provided.

[codecov]

Codecov Report

Merging #14 into master will increase coverage by 3.03%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           master    #14      +/-   ##
========================================
+ Coverage   96.96%   100%   +3.03%     
========================================
  Files           3      3              
  Lines          33     33              
========================================
+ Hits           32     33       +1     
+ Misses          1      0       -1

Impacted Files	Coverage Δ
bin/cli.js	100% <0%> (+25%)	⬆️

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