Automatically check dependency gems for security vulnerabilities

[mark-dce]

STORY
As a repository service manager, I want to make sure my dependencies a reviewed periodically, so that I don't leave open security vulnerabilities unaddressed.

DETAILS
There is a tool called Gymnasium which checks for know security issues.
Example: https://gemnasium.com/curationexperts
Sign up at https://gemnasium.com/users/sign_up

ACCEPTANCE

• There is a dynamically updated dependency badge on the README for the repo.