Provide a 'Changelog' link on rubygems.org/gems/stringio #395

Job	Run time
ruby-versions / Generate Ruby versions	2s
ubuntu-24.04 2.7	44s
ubuntu-24.04 3.0	10s
ubuntu-24.04 3.1	9s
ubuntu-24.04 3.2	12s
ubuntu-24.04 3.3	12s
ubuntu-24.04 3.4	15s
ubuntu-24.04 debug	26s
ubuntu-24.04 head	11s
ubuntu-24.04 jruby-head	54s
ubuntu-24.04 truffleruby-head	27s
ubuntu-22.04 2.7	35s
ubuntu-22.04 3.0	16s
ubuntu-22.04 3.1	14s
ubuntu-22.04 3.2	13s
ubuntu-22.04 3.3	15s
ubuntu-22.04 3.4	12s
ubuntu-22.04 debug	19s
ubuntu-22.04 head	10s
ubuntu-22.04 jruby-head	59s
ubuntu-22.04 truffleruby-head	27s
	7m 22s

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