Update release script
Update release script

Had an issue where I don't git pull / merge with master after the PR has
been merged.

This adds an option to sync with master before continuing.

gitlawr/kompose,procrypt/kompose,rupalibehera/kompose,kadel/kompose,procrypt/kompose,containscafeine/kompose,gitlawr/kompose,procrypt/kompose,cdrage/kompose,skippbox/kompose,kubernetes/kompose,skippbox/kompose,gitlawr/kompose,ashetty1/kompose,skippbox/kompose,surajnarwade/kompose,kubernetes/kompose,surajnarwade/kompose,ashetty1/kompose,containscafeine/kompose,rupalibehera/kompose,rupalibehera/kompose,surajnarwade/kompose,kadel/kompose,ashetty1/kompose,cdrage/kompose,containscafeine/kompose