Add in the rack environment as a tag
Add in the rack environment as a tag

Tags are currently unused, and it’d be nice to add in the server
environment SOMEWHERE.

MindscapeHQ/raygun4ruby,theodi/raygun4ruby,eoinkelly/raygun4ruby,toxaq/raygun4ruby,MindscapeHQ/raygun4ruby,MindscapeHQ/raygun4ruby,triplepointfive/raygun4ruby