Merge pull request #54 from emacs-php/drop/old-emacsen #76

Job	Run time
build (ubuntu-latest, 27.2, false)	42s
build (ubuntu-latest, 28.2, false)	43s
build (ubuntu-latest, 29.4, false)	1m 2s
build (macos-latest, 28.2, false)	1m 36s
build (macos-latest, 29.4, false)	2m 13s
build (windows-latest, 27.2, false)	1m 55s
build (windows-latest, 28.2, false)	1m 43s
build (windows-latest, 29.4, false)	2m 23s
build (ubuntu-latest, snapshot, true)	41s
build (macos-latest, snapshot, true)	1m 40s
build (windows-latest, snapshot, true)	3m 33s
	18m 11s

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