Add missing dependency (Ruby)
Add missing dependency (Ruby)

Needed to run the x-api, locally.
FridaTveit/xjava,jtigger/xjava,jmluy/xjava,nickRm/xjava,exercism/xjava,nickRm/xjava,jmluy/xjava,FridaTveit/xjava,exercism/xjava,jtigger/xjava,masters3d/xjava,masters3d/xjava