Fix github workflows link in README #241

# to view logs

Job	Run time
test (ubuntu, 2.6, false)	4m 43s
test (ubuntu, 2.7, false)	4m 41s
test (ubuntu, 3.0, false)	4m 24s
test (ubuntu, 3.1, false)	5m 2s
test (ubuntu, 3.2, false)	4m 25s
test (macos, 2.6, false)	5m 12s
test (macos, 2.7, false)	5m 57s
test (macos, 3.0, false)	4m 35s
test (macos, 3.1, false)	4m 32s
test (macos, 3.2, false)	5m 4s
test (macos, truffleruby-head, true)	6m 45s
test (ubuntu, truffleruby-head, true)	4m 59s
test (ubuntu, jruby, true)	5m 1s
test (ubuntu, head, true)	4m 44s
	1h 10m 4s

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