Add Long Beach, Calif. to list of cities using this spec.

For [lbcflushots.org](http://www.lbcflushots.org), Long Beach, Calif. is now publishing flu shot locations in a [Google Fusion table](https://www.google.com/fusiontables/DataSource?docid=1n5PNdxLZu9-neTWzfpnpGknTv3rntZ99IMUPpiM#rows:id=1) formatted in accordance with this spec. This pull request adds Long Beach to the list of cities using this spec.