Merge pull request #25 from emacs-lsp/feat/drop-27 #25

Job	Run time
build (ubuntu-latest, 28.2, false)	1m 0s
build (ubuntu-latest, 29.4, false)	1m 1s
build (ubuntu-latest, 30.1, false)	1m 0s
build (macos-latest, 28.2, false)	1m 53s
build (macos-latest, 29.4, false)	2m 42s
build (macos-latest, 30.1, false)	2m 0s
build (windows-latest, 28.2, false)	1m 45s
build (windows-latest, 29.4, false)	3m 0s
build (windows-latest, 30.1, false)	2m 4s
build (ubuntu-latest, snapshot, true)	51s
build (macos-latest, snapshot, true)	1m 34s
build (windows-latest, snapshot, true)	2m 25s
	21m 15s

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