Bump grunt branch versions to 6.3

Lets give this a try again...#fingerscrossed

In the original pull request I was going to add 'Am I doing it right' in the description... Should have...Hahaha... Needless to say I am still trying to grok Git branches...

I think this was originally wrong because I should have run 'git pull upstream grunt' on the 'grunt' branch of my clone before making my branch 'bumpgrunt' and submitting the pull request.

I ended up killing my clone with funky rebase commits, deleted repo and started again.