fix NODE warning and support node 10

[eugene-matvejev]

No description provided.

[codecov]

Codecov Report

Merging #44 into master will decrease coverage by 1.77%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master      #44      +/-   ##
==========================================
- Coverage   92.15%   90.38%   -1.78%     
==========================================
  Files           2        2              
  Lines          51       52       +1     
  Branches        3        3              
==========================================
  Hits           47       47              
- Misses          4        5       +1

Impacted Files	Coverage Δ
src/processor.js	87.17% <0%> (-2.3%)	⬇️

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