Update asset loader

[guybedford]

Updates to release:

• https://github.com/zeit/webpack-asset-relocator-loader/releases/tag/0.5.2.
• https://github.com/zeit/webpack-asset-relocator-loader/releases/tag/0.5.3

[codecov-io]

Codecov Report

Merging #418 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #418   +/-   ##
=======================================
  Coverage   73.65%   73.65%           
=======================================
  Files          13       13           
  Lines         391      391           
=======================================
  Hits          288      288           
  Misses        103      103

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[styfle]

Does this close any issues?