Merge Develop to Master: 3.5.1

[srod]

• Remove xtend (feat(package): remove xtend #438) (254a471)
• Don't mutate defaultOptions (fix(html-minifier): don't mutate defaultOptions #439) (ec7e61f)
• Bump packages

[codecov]

Codecov Report

Merging #440 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #440   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          22     22           
  Lines         436    434    -2     
  Branches       82     82           
=====================================
- Hits          436    434    -2

Impacted Files	Coverage Δ
lib/compressors/html-minifier.js	100% <100%> (ø)	⬆️
lib/setup.js	100% <100%> (ø)	⬆️

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