fix: Node 10 is required for async/await

[bcoe]

fixes: #14

[codecov]

Codecov Report

Merging #89 into master will decrease coverage by 0.04%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master      #89      +/-   ##
==========================================
- Coverage   47.31%   47.27%   -0.05%     
==========================================
  Files           9        9              
  Lines        1154     1155       +1     
  Branches       31       31              
==========================================
  Hits          546      546              
- Misses        606      607       +1     
  Partials        2        2

Impacted Files	Coverage Δ
src/candidate-issue.ts	41.37% <33.33%> (-0.24%)	⬇️

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