Add Dockerfile required package to appease billy-util download-photos
Add Dockerfile required package to appease billy-util download-photos

sunlightlabs/billy,mileswwatkins/billy,sunlightlabs/billy,openstates/billy,loandy/billy,openstates/billy,sunlightlabs/billy,loandy/billy,mileswwatkins/billy,mileswwatkins/billy,loandy/billy,openstates/billy