Run `bundle update`
Run `bundle update`

I noticed that gems that need security updates, such as activerecord,
aren't updated yet. I went ahead and updated the whole bundle.

`tilt` upgraded to a major version and fortunately the tests still
pass.

tejasbubane/exercism.io,RaptorRCX/exercism.io,IanDCarroll/exercism.io,mhelmetag/exercism.io,nathanbwright/exercism.io,jtigger/exercism.io,jtigger/exercism.io,Tonkpils/exercism.io,nathanbwright/exercism.io,RaptorRCX/exercism.io,nathanbwright/exercism.io,mhelmetag/exercism.io,Tonkpils/exercism.io,nathanbwright/exercism.io,tejasbubane/exercism.io,treiff/exercism.io,IanDCarroll/exercism.io,Tonkpils/exercism.io,treiff/exercism.io,jtigger/exercism.io,treiff/exercism.io,tejasbubane/exercism.io,Tonkpils/exercism.io,IanDCarroll/exercism.io,treiff/exercism.io,RaptorRCX/exercism.io,RaptorRCX/exercism.io,tejasbubane/exercism.io,jtigger/exercism.io,mhelmetag/exercism.io,IanDCarroll/exercism.io,mhelmetag/exercism.io