.github/workflows/ci.yml

Use single quotes around 'maybe' atom for compatibility with OTP 27 #78

# to view logs

Run time

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Job	Run time
test 27 on ubuntu-latest	46s
test 26 on ubuntu-latest	52s
test 25 on ubuntu-latest	55s
test 24 on ubuntu-latest	55s
test 23 on ubuntu-latest	1m 4s
test 22 on ubuntu-latest	55s
test 21 on ubuntu-latest	48s
test 20 on ubuntu-latest	50s
test 19 on ubuntu-latest	49s
test 18 on ubuntu-latest	56s
	8m 50s