chore(deps): update devdependency loader-utils to v2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
loader-utils	devDependencies	major	^1.4.0 -> ^2.0.0

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Release Notes

webpack/loader-utils

v2.0.0

Compare Source

⚠ BREAKING CHANGES

• minimum required Node.js version is 8.9.0 (#​166) (c937e8c)
• the getOptions method returns empty object on empty query (#​167) (b595cfb)
• Use md4 by default

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[codecov]

Codecov Report

Merging #4956 into dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #4956   +/-   ##
=======================================
  Coverage   99.93%   99.93%           
=======================================
  Files         271      271           
  Lines        6148     6148           
  Branches     1605     1605           
=======================================
  Hits         6144     6144           
  Misses          3        3           
  Partials        1        1

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