Fix ENOENT when dest in tmpdir (#60)

[nandenjin]

Fixes #60 .

• Make normalizePath()returns absolute path
• Fix lint errors (to run tests)

I'm not sure how this change affects in other environment or cases. Let me know if anyone notice about this.

[codecov]

Codecov Report

Merging #61 into master will decrease coverage by 0.05%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #61      +/-   ##
==========================================
- Coverage   83.93%   83.87%   -0.06%     
==========================================
  Files          17       17              
  Lines         610      459     -151     
==========================================
- Hits          512      385     -127     
+ Misses         98       74      -24

Impacted Files	Coverage Δ
lib/utils/normalize-path.js	77.77% <100%> (-2.23%)	⬇️
lib/utils/copy-file.js	65.78% <0%> (-5.37%)	⬇️
lib/utils/watcher.js	80% <0%> (-2.31%)	⬇️
lib/utils/apply-action.js	62.5% <0%> (-1.39%)	⬇️
lib/utils/normalize-options.js	100% <0%> (ø)	⬆️

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