[release] Bump NQP revision to 2018.06
[release] Bump NQP revision to 2018.06

labster/rakudo,tbrowder/rakudo,Gnouc/rakudo,rakudo/rakudo,nbrown/rakudo,salortiz/rakudo,tony-o/rakudo,tony-o/rakudo,labster/rakudo,MasterDuke17/rakudo,softmoth/rakudo,Gnouc/rakudo,tbrowder/rakudo,MasterDuke17/rakudo,rakudo/rakudo,tony-o/rakudo,rakudo/rakudo,salortiz/rakudo,Gnouc/rakudo,MasterDuke17/rakudo,tony-o/rakudo,rakudo/rakudo,tbrowder/rakudo,salortiz/rakudo,Gnouc/rakudo,labster/rakudo,softmoth/rakudo,tbrowder/rakudo,tbrowder/rakudo,labster/rakudo,nbrown/rakudo,nbrown/rakudo,salortiz/rakudo,labster/rakudo,nbrown/rakudo,softmoth/rakudo,nbrown/rakudo,rakudo/rakudo,Gnouc/rakudo,tony-o/rakudo,softmoth/rakudo,tony-o/rakudo,labster/rakudo,Gnouc/rakudo,softmoth/rakudo,MasterDuke17/rakudo,tbrowder/rakudo,salortiz/rakudo,salortiz/rakudo,MasterDuke17/rakudo,rakudo/rakudo,MasterDuke17/rakudo,nbrown/rakudo