fix(deps): update dependency cssnano to ^4.1.4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
cssnano	dependencies	patch	^4.1.3 -> ^4.1.4	source

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Release Notes

cssnano/cssnano

v4.1.4

Compare Source

4.1.4 - 2018-09-27

Other changes

• css-declaration-sorter now use PostCSS 7
• postcss-calc now use PostCSS 7

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[renovate]

Branch automerge failure

This PR was configured for branch automerge, however this is not possible so it has been raised as a PR instead.

[codecov-io]

Codecov Report

Merging #3990 into dev will increase coverage by 0.08%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              dev    #3990      +/-   ##
==========================================
+ Coverage   97.48%   97.56%   +0.08%     
==========================================
  Files          18       18              
  Lines        1233     1233              
  Branches      337      337              
==========================================
+ Hits         1202     1203       +1     
+ Misses         30       29       -1     
  Partials        1        1

Impacted Files	Coverage Δ
lib/core/nuxt.js	95% <0%> (+0.83%)	⬆️

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