Provide a 'Changelog' link on rubygems.org/gems/highline #54

Job	Run time
test (ubuntu-latest, head)	1m 28s
test (ubuntu-latest, 3.3)	1m 17s
test (ubuntu-latest, 3.2)	1m 31s
test (ubuntu-latest, 3.1)	1m 10s
test (ubuntu-latest, 3.0)	1m 8s
test (ubuntu-latest, jruby)	40s
test (ubuntu-latest, jruby-head)	48s
test (ubuntu-latest, truffleruby)	1m 47s
test (ubuntu-latest, truffleruby-head)	1m 52s
test (ubuntu-latest, truffleruby+graalvm)	4m 34s
test (windows-latest, head)	1m 46s
test (windows-latest, 3.3)	4m 56s
test (windows-latest, mingw)	3m 20s
test (windows-latest, mswin)	1m 40s
test (windows-latest, ucrt)	1m 40s
test (macos-latest, head)	2m 39s
test (macos-latest, 3.3)	2m 33s
	34m 49s

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