Remove uglifyjs-webpack-plugin from dependency

[smsunarto]

What's changing?

I was browsing through and saw #82. It seems like uglifyjs is no longer used so there's no need to have it in the dependencies anymore.

Remove uglifyjs-webpack-plugin from dependencies

What else might be impacted?

There might be something I didn't notice that was using it. I already ran yarn-check and grep to make sure though.

Checklist

• Documentation
• New Tests
• Added myself to contributors table
• Added SemVer label
• Ready to be merged

[hipstersmoothie]

Published PR with canary version: 1.10.10-canary.118.1702

[codecov]

Codecov Report

Merging #118 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #118   +/-   ##
=======================================
  Coverage   84.66%   84.66%           
=======================================
  Files          47       47           
  Lines         998      998           
  Branches      139      139           
=======================================
  Hits          845      845           
  Misses        153      153

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