Update CONTRIBUTING.md #538

Job	Run time
Lint (18.x)	37s
Build and run integration tests (18.x)	2m 47s
Lint (19.x)	35s
JS Tests (16.x)	2m 44s
Lint (20.x)	34s
Build and run integration tests (19.x)	2m 42s
JS Tests (18.x)	2m 46s
Lint (21.x)	30s
Build and run integration tests (20.x)	2m 32s
JS Tests (19.x)	2m 42s
Build and run integration tests (21.x)	2m 28s
JS Tests (20.x)	2m 31s
JS Tests (21.x)	2m 32s
Publish to NPM	33s
	26m 33s

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