Update dependency uglifyjs-webpack-plugin to v2.1.2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
uglifyjs-webpack-plugin	devDependencies	patch	2.1.1 -> 2.1.2	source

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Release Notes

webpack-contrib/uglifyjs-webpack-plugin

v2.1.2

Compare Source

Bug Fixes

• invalidate cache after changing node version (#​396) (380bb54)

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[codecov-io]

Codecov Report

Merging #104 into develop will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           develop   #104   +/-   ##
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  Coverage      100%   100%           
======================================
  Files            9      9           
  Lines          122    122           
  Branches        25     25           
======================================
  Hits           122    122

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