README: use pipeline badge instead of deprecated build badge.

2 jobs for master in 10 minutes and 19 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
failed #525
jessie

00:05:32

passed #526
stretch

00:04:47

88.0%
 
Name Stage Failure
failed
jessie Test
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PTAvjV+4ni786iXwwFYNz8l3PmPLCyQXWGohnJ8iBm+5nk7O2ynaPVW0U2W+pt2w
SVuvdDM5zGv2f9ltNWUiYZHJ1mmO97jSY/6YfdOUH66iRtQtDkHBRdkNBsMbD+Em
2TgBldtHNSJBfB3pm9FblgOcJ0FSWcUDWJ7vO0+NTXlgrRofRT6pVywzxVo6dND0
WzYlTWeUVsO40xJqhgUQRER9YLOLxJ0O6C8i0xFxAMKOtSdodMB3RIwt7RFQ0uyt
n5Z5MqkYhlMI3J1tPRTp1nEt9fyGspBOO05gi148Qasp+3N+svqKomoQglNoAxU=
-----END CERTIFICATE-----
ERROR: Job failed: exit code 1