Forgot to remove the repo from travis.

This is needed so tags will force a build here.

Just need one last thing from you to make this automated. 

Generate a new token on github with just `public_repo` scope here: https://github.com/settings/tokens/new, then copy the token to https://travis-ci.org/slamdata/slamdata/settings/env_vars/new with the name `GITHUB_RELEASES_TOKEN`.