Add brotli support #70

Job	Run time
Unit Tests (ubuntu, 2.7, gemfiles/rails_6_0.gemfile, false)	39s
Unit Tests (ubuntu, 2.7, gemfiles/rails_6_1.gemfile, false)	36s
Unit Tests (ubuntu, 2.7, gemfiles/rails_7_0.gemfile, false)	32s
Unit Tests (ubuntu, 3, gemfiles/rails_6_0.gemfile, false)	20s
Unit Tests (ubuntu, 3, gemfiles/rails_6_1.gemfile, false)	14s
Unit Tests (ubuntu, 3, gemfiles/rails_7_0.gemfile, false)	15s
Unit Tests (ubuntu, 3.1, gemfiles/rails_6_0.gemfile, false)	15s
Unit Tests (ubuntu, 3.1, gemfiles/rails_6_1.gemfile, false)	18s
Unit Tests (ubuntu, 3.1, gemfiles/rails_7_0.gemfile, false)	15s
Unit Tests (ubuntu, 3.2, gemfiles/rails_6_0.gemfile, false)	18s
Unit Tests (ubuntu, 3.2, gemfiles/rails_6_1.gemfile, false)	15s
Unit Tests (ubuntu, 3.2, gemfiles/rails_7_0.gemfile, false)	13s
Unit Tests (ubuntu, jruby, gemfiles/rails_6_0.gemfile, false)	1m 13s
Unit Tests (ubuntu, jruby, gemfiles/rails_6_1.gemfile, false)	1m 22s
Unit Tests (ubuntu, ruby-head, gemfiles/rails_7_0.gemfile, true)	25s
Unit Tests (ubuntu, jruby-head, gemfiles/rails_7_0.gemfile, true)	1m 8s
	8m 18s

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