Remove ERB dependency (#635) #1567

Job	Run time
rubocop	14s
tests (ubuntu-latest, 2.7)	26s
tests (ubuntu-latest, 3.0)	9s
tests (ubuntu-latest, 3.1)	10s
tests (ubuntu-latest, 3.2)	11s
tests (ubuntu-latest, head)	9s
tests (ubuntu-latest, truffleruby-22.2)	35s
tests (ubuntu-latest, truffleruby-22.3)	34s
tests (ubuntu-latest, truffleruby-head)	26s
tests (macos-latest, 2.7)	56s
tests (macos-latest, 3.0)	21s
tests (macos-latest, 3.1)	22s
tests (macos-latest, 3.2)	23s
tests (macos-latest, head)	1s
tests (macos-latest, truffleruby-22.2)	1m 7s
tests (macos-latest, truffleruby-22.3)	1m 4s
tests (macos-latest, truffleruby-head)	57s
	8m 5s

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