Fix unescapeHTML #163

Job	Run time
ruby-versions / Generate Ruby versions	2s
build (2.5 / ubuntu-latest)	18s
build (2.5 / macos-latest)	45s
build (2.5 / windows-latest)	2m 12s
build (2.6 / ubuntu-latest)	21s
build (2.6 / macos-latest)	1m 35s
build (2.6 / windows-latest)	3m 13s
build (2.7 / ubuntu-latest)	19s
build (2.7 / macos-latest)	53s
build (2.7 / windows-latest)	1m 39s
build (3.0 / ubuntu-latest)	6s
build (3.0 / macos-latest)	23s
build (3.0 / windows-latest)	1m 28s
build (3.1 / ubuntu-latest)	10s
build (3.1 / macos-latest)	15s
build (3.1 / windows-latest)	1m 13s
build (3.2 / ubuntu-latest)	9s
build (3.2 / macos-latest)	28s
build (3.2 / windows-latest)	1m 21s
build (head / ubuntu-latest)	7s
build (head / macos-latest)	31s
build (jruby / ubuntu-latest)	39s
build (jruby-head / ubuntu-latest)	38s
build (truffleruby / ubuntu-latest)	27s
build (truffleruby / macos-latest)	1m 8s
build (truffleruby-head / ubuntu-latest)	30s
build (truffleruby-head / macos-latest)	44s
build (mingw / windows-latest)	1m 9s
build (mswin / windows-latest)	1m 31s
	24m 14s

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