Fixes #12: redirects stdout/stderr of failed process

[phishy]

[codecov[bot]]

Codecov Report

Merging #13 into master will decrease coverage by 0.75%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #13      +/-   ##
==========================================
- Coverage   75.51%   74.75%   -0.76%     
==========================================
  Files           2        3       +1     
  Lines          98      103       +5     
  Branches       15       15              
==========================================
+ Hits           74       77       +3     
- Misses         21       22       +1     
- Partials        3        4       +1

Impacted Files	Coverage Δ
lib/action.js	83.52% <100%> (+8.52%)	:arrow_up:
plugins/checkout/index.js	21.42% <0%> (-57.15%)	:arrow_down:
lib/loadYaml.js	75% <0%> (ø)

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