macos

Add a note about chilled string support to 3.1.8 release note (#180) #587

Job	Run time
ruby-versions / Generate Ruby versions	3s
macos-13 2.7	1m 1s
macos-13 3.1	22s
macos-13 3.3	27s
macos-13 3.2	32s
macos-13 head	21s
macos-13 debug	29s
macos-14 3.3	16s
macos-14 3.1	16s
macos-14 2.7	34s
macos-14 3.0	18s
macos-13 3.0	21s
macos-13 jruby-head	3m 14s
macos-14 3.2	20s
macos-13 3.4	24s
macos-14 3.4	23s
macos-14 head	20s
macos-14 jruby-head	39s
macos-14 debug	24s
	10m 44s

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