Updated Vert-X to 1.3.1

[spiegela]

No description provided.

[adamv]

Thanks for the update. Note that for simple version updates we prefer commit messages of the form name version, and when a correction needs to be made, we prefer that it be squashed to a single commit. If you make pull requests from non-master branches, you can use git push -f after git rebase to update the pull request in-place.