Merge pull request #589 from pvdb/refactor_heredocs #569

Job	Run time
ruby-versions / Generate Ruby versions	2s
test (ubuntu-latest, 2.3)	42s
test (ubuntu-latest, 2.4)	38s
test (ubuntu-latest, 2.5)	40s
test (ubuntu-latest, 2.6)	49s
test (ubuntu-latest, 2.7)	46s
test (ubuntu-latest, 3.0)	15s
test (ubuntu-latest, 3.1)	15s
test (ubuntu-latest, 3.2)	18s
test (ubuntu-latest, 3.3)	16s
test (ubuntu-latest, head)	16s
test (ubuntu-latest, jruby)	4m 8s
test (ubuntu-latest, jruby-head)	3m 53s
test (ubuntu-latest, truffleruby)	52s
test (windows-latest, 2.3)	1m 35s
test (windows-latest, 2.4)	1m 51s
test (windows-latest, 2.5)	3m 30s
test (windows-latest, 2.6)	3m 40s
test (windows-latest, 2.7)	3m 33s
test (windows-latest, 3.0)	1m 34s
test (windows-latest, 3.1)	1m 38s
test (windows-latest, 3.2)	1m 36s
test (windows-latest, 3.3)	2m 16s
test (windows-latest, head)	1m 33s
	36m 36s

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