Fixes electon hmr bug

[DeMoorJasper]

closes #856

[codecov-io]

Codecov Report

Merging #921 into master will decrease coverage by 0.34%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #921      +/-   ##
==========================================
- Coverage   89.58%   89.24%   -0.35%     
==========================================
  Files          68       68              
  Lines        3255     3448     +193     
==========================================
+ Hits         2916     3077     +161     
- Misses        339      371      +32

Impacted Files	Coverage Δ
src/Bundler.js	92.85% <ø> (ø)	⬆️
src/visitors/fs.js	57.63% <0%> (-22.23%)	⬇️
src/assets/WebManifestAsset.js	59.18% <0%> (-19.39%)	⬇️
src/assets/JSONAsset.js	84.61% <0%> (-8.72%)	⬇️
src/assets/SASSAsset.js	91.48% <0%> (-8.52%)	⬇️
src/assets/LESSAsset.js	93.18% <0%> (-6.82%)	⬇️
src/utils/installPackage.js	61.9% <0%> (-3.18%)	⬇️
src/assets/CSSAsset.js	83.47% <0%> (-2.61%)	⬇️
src/assets/JSAsset.js	91.6% <0%> (-2.3%)	⬇️
src/utils/serializeObject.js	88.23% <0%> (-1.77%)	⬇️
... and 14 more

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