chore: Update to webpack-defaults 1.6

[mattlewis92]

Now node 8.2 is stable these hacks I added in #208 can be removed. Doing npm i on a fresh checkout of the repo somehow updated the package-lock as well which was a bit odd.

edit: looks like appveyor is still on node 8.1 which has the buggy npm 5.0.x, will have to wait a bit for them to upgrade. Can use https://www.appveyor.com/updates/ for tracking when node 8.2.x is added.

[alexander-akait]

@mattlewis92 seems it is already fixed into webpack-defaults, maybe just update to latest webpack-defaults?

[mattlewis92]

@evilebottnawi this package is on the latest webpack-defaults, this PR is undoing some extra changes I added to get the CI to pass (as the npm version bundled with node 8.1 was super buggy), however node 8.2 with npm 5.3.0 is now out so these hacks aren't needed anymore.

[codecov]

Codecov Report

Merging #212 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #212   +/-   ##
=======================================
  Coverage   97.84%   97.84%           
=======================================
  Files           8        8           
  Lines          93       93           
  Branches        9        9           
=======================================
  Hits           91       91           
  Misses          2        2

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[michael-ciniawsky]

👍 when appveyor has node updated aswell :)

[joshwiens]

Appveyor....where latest isn't actually latest

[mattlewis92]

Looking at their update history, it's probably going to be another month before they add node 8.2 😕