Add spec to the result of Coverage lib for `begin` #1665

Job	Run time
RuboCop	26s
specs (ubuntu, 3.0.6)	1m 31s
specs (ubuntu, 3.1.4)	1m 28s
specs (ubuntu, 3.2.2)	1m 25s
specs (ubuntu, 3.3.0)	1m 26s
specs (macos, 3.0.6)	1m 23s
specs (macos, 3.1.4)	1m 26s
specs (macos, 3.2.2)	1m 15s
specs (macos, 3.3.0)	1m 10s
specs (windows, 3.0.6)	5m 8s
specs (windows, 3.1.4)	4m 58s
specs (windows, 3.2.2)	4m 35s
specs (windows, 3.3.0)	3m 42s
specs (ubuntu, 3.3.0, --enable-frozen-string-literal)	1m 23s
	31m 16s

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