refactor(loader) v2.0.0

[joshwiens]

• Fixes for Webpack 4.x
• Drops support for NodeJS 4.x
• Sets minimum peerDep to Webpack 3.x

BREAKING CHANGE: Sets engines to "node": ">= 6.9.0 || >= 8.9.0"
BREAKING CHANGE: Drops support for Webpack v2.x

[ooflorent]

Some targets are no longer available in webpack 4:

• atom
• electron

[ooflorent]

I've open a PR (webpack/webpack#6368) to expose the required internal plugins. In v2, you should drop the hot-linking of internal dependencies. This may prevent having a build step on webpack.

[switz]

Checking in on when we can merge this and #121

[benpoulson]

Really could do with this merge going ahead. Holding my team back from moving to Webpack 4.X.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@4f7a931). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
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  Coverage          ?   66.21%           
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  Files             ?        5           
  Lines             ?       74           
  Branches          ?       25           
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  Hits              ?       49           
  Misses            ?       22           
  Partials          ?        3

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