fix typo in README

5 jobs for master in 4 minutes and 58 seconds
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Status Name Job ID Coverage
  Test
failed test_node4 #176688

00:04:58

failed test_node5 #176689

00:04:30

failed test_node6 #176690

00:04:30

failed test_node7 #176691

00:04:16

failed test_node8 #176692

00:03:22

 
Name Stage Failure
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test_node8 Test
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test_node7 Test
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test_node4 Test
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test_node6 Test
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test_node5 Test
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