Bump version of webmock to support ruby 2.6
Bump version of webmock to support ruby 2.6

avalonmediasystem/avalon,avalonmediasystem/avalon,avalonmediasystem/avalon,ualbertalib/avalon,nulib/avalon,uvalib/avalon,uvalib/avalon,uvalib/avalon,ualbertalib/avalon,ualbertalib/avalon,nulib/avalon,nulib/avalon,uvalib/avalon,avalonmediasystem/avalon,ualbertalib/avalon,nulib/avalon