Add an empty CHANGELOG.md (#11) #72

Job	Run time
test (ubuntu-latest, 2.7)	2m 43s
test (ubuntu-latest, 3.0)	2m 37s
test (ubuntu-latest, 3.1)	2m 39s
test (ubuntu-latest, head)	2m 29s
test (ubuntu-latest, jruby)	3m 21s
test (ubuntu-latest, jruby-head)	3m 22s
test (ubuntu-latest, truffleruby)	3m 29s
test (ubuntu-latest, truffleruby-head)	6m 16s
test (macos-latest, 2.7)	3m 33s
test (macos-latest, 3.0)	2m 54s
test (macos-latest, 3.1)	2m 39s
test (macos-latest, head)	2m 40s
test (macos-latest, jruby)	4m 16s
test (macos-latest, jruby-head)	3m 49s
test (macos-latest, truffleruby)	4m 11s
test (macos-latest, truffleruby-head)	6m 9s
	57m 7s

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