Add brotli support #66

Job	Run time
Unit Tests (ubuntu, 2.7, gemfiles/rails_6_0.gemfile, false)	48s
Unit Tests (ubuntu, 2.7, gemfiles/rails_6_1.gemfile, false)	46s
Unit Tests (ubuntu, 2.7, gemfiles/rails_7_0.gemfile, false)	51s
Unit Tests (ubuntu, 3, gemfiles/rails_6_0.gemfile, false)	11s
Unit Tests (ubuntu, 3, gemfiles/rails_6_1.gemfile, false)	13s
Unit Tests (ubuntu, 3, gemfiles/rails_7_0.gemfile, false)	14s
Unit Tests (ubuntu, 3.1, gemfiles/rails_6_0.gemfile, false)	26s
Unit Tests (ubuntu, 3.1, gemfiles/rails_6_1.gemfile, false)	33s
Unit Tests (ubuntu, 3.1, gemfiles/rails_7_0.gemfile, false)	37s
Unit Tests (ubuntu, 3.2, gemfiles/rails_6_0.gemfile, false)	27s
Unit Tests (ubuntu, 3.2, gemfiles/rails_6_1.gemfile, false)	27s
Unit Tests (ubuntu, 3.2, gemfiles/rails_7_0.gemfile, false)	26s
Unit Tests (ubuntu, jruby, gemfiles/rails_6_0.gemfile, false)	1m 42s
Unit Tests (ubuntu, jruby, gemfiles/rails_6_1.gemfile, false)	1m 11s
Unit Tests (ubuntu, ruby-head, gemfiles/rails_7_0.gemfile, true)	1m 30s
Unit Tests (ubuntu, jruby-head, gemfiles/rails_7_0.gemfile, true)	1m 29s
	11m 51s

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