Update @pwa/plugin-brotli [BREAKING CHANGE]

[Saiv46]

Requires Node v10.13+ and Webpack v5.1+

• Updated compression-webpack-plugin, which has 2 vulnerabilities (1 moderate, 1 high)
• Replaced deprecated iltorb in favor of built-in zlib (support available since v10.16.0)

[codecov-io]

Codecov Report

Merging #75 (dd5f1b4) into master (3d4475f) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #75   +/-   ##
=======================================
  Coverage   87.09%   87.09%           
=======================================
  Files           2        2           
  Lines          31       31           
=======================================
  Hits           27       27           
  Misses          4        4           

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[Saiv46]

compression-webpack-plugin now uses WebPack 5.70+ and NodeJS 12.13+