Fix appveyor build

[vmihdal]

No description provided.

[codecov]

Codecov Report

Merging #2 into node-v12 will increase coverage by 62.96%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           node-v12     #2       +/-   ##
===========================================
+ Coverage     37.03%   100%   +62.96%     
===========================================
  Files             4      4               
  Lines            54     54               
===========================================
+ Hits             20     54       +34     
+ Misses           34      0       -34

Impacted Files	Coverage Δ
lib/index.js	100% <0%> (+40%)	⬆️
lib/signals.js	100% <0%> (+62.5%)	⬆️
lib/windows-kill-class.js	100% <0%> (+67.85%)	⬆️
lib/options.js	100% <0%> (+75%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update a6dbb3a...daf28f1. Read the comment docs.