Provide a 'Changelog' link on rubygems.org/gems/racc #119

Job	Run time
ruby-versions / Generate Ruby versions	1s
test (2.5, ubuntu-latest)	24s
test (2.5, windows-latest)	2m 7s
test (2.6, ubuntu-latest)	27s
test (2.6, macos-latest)	36s
test (2.6, windows-latest)	2m 55s
test (2.7, ubuntu-latest)	26s
test (2.7, macos-latest)	45s
test (2.7, windows-latest)	2m 34s
test (3.0, ubuntu-latest)	16s
test (3.0, macos-latest)	19s
test (3.0, windows-latest)	1m 27s
test (3.1, ubuntu-latest)	18s
test (3.1, macos-latest)	30s
test (3.1, windows-latest)	1m 25s
test (3.2, ubuntu-latest)	14s
test (3.2, macos-latest)	21s
test (3.2, windows-latest)	2m 32s
test (3.3, ubuntu-latest)	18s
test (3.3, macos-latest)	20s
test (3.3, windows-latest)	2m 40s
test (head, ubuntu-latest)	15s
test (head, macos-latest)	19s
test (head, windows-latest)	1m 30s
test (jruby, ubuntu-latest)	4m 35s
test (jruby-head, ubuntu-latest)	4m 30s
test (truffleruby, ubuntu-latest)	1m 38s
test (truffleruby-head, ubuntu-latest)	2m 0s
	35m 42s

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