add CHANGELOG.md to list of gem files #123

Job	Run time
build (ubuntu-20.04, 3.0, norails, 6, 5, false)	46s
build (ubuntu-20.04, 3.0, rails_6.0, 6, 5, false)	50s
build (ubuntu-20.04, 3.0, rails_6.1, 6, 5, false)	51s
build (ubuntu-20.04, 2.7, norails, 6, 5, false)	55s
build (ubuntu-20.04, 2.7, rails_6.0, 6, 5, false)	1m 7s
build (ubuntu-20.04, 2.7, rails_6.1, 6, 5, false)	1m 3s
build (ubuntu-20.04, 2.6, norails, 6, 5, false)	1m 7s
build (ubuntu-20.04, 2.6, rails_5.2, 6, 5, false)	1m 8s
build (ubuntu-20.04, 2.6, rails_6.0, 6, 5, false)	1m 9s
build (ubuntu-20.04, 2.6, rails_6.1, 6, 5, false)	1m 10s
build (ubuntu-20.04, jruby-9.1.17.0, rails_4.2, 6, 5, false)	1m 13s
build (ubuntu-20.04, jruby-9.1.17.0, rails_4.2_mongoid_5, 6, 5, false)	1m 36s
build (ubuntu-20.04, jruby-9.1.17.0, rails_6.0, 6, 5, false)	46s
build (ubuntu-20.04, truffleruby, norails, 6, 5, false)	1m 21s
build (ubuntu-20.04, truffleruby, rails_6.0, 6, 5, false)	1m 58s
build (3.1, rails_7.0, ubuntu-20.04, 6, 5)	1m 6s
build (3.2, rails_7.0, ubuntu-20.04, 6, 5)	53s
build (3.1, rails_7.1, ubuntu-20.04, 6, 5)	57s
build (3.2, rails_7.1, ubuntu-20.04, 6, 5)	49s
	20m 45s

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