fix build - CRAN check complains about ability to check time
fix build - CRAN check complains about ability to check time

Reason: worldclock API is down

see https://stackoverflow.com/questions/63613301/r-cmd-check-note-unable-to-verify-current-time

michalkurka/h2o-3,michalkurka/h2o-3,h2oai/h2o-3,h2oai/h2o-3,michalkurka/h2o-3,michalkurka/h2o-3,h2oai/h2o-3,h2oai/h2o-3,michalkurka/h2o-3,h2oai/h2o-3,h2oai/h2o-3,h2oai/h2o-3,michalkurka/h2o-3,h2oai/h2o-3,michalkurka/h2o-3