s/panda/zef/ in REPL message
s/panda/zef/ in REPL message

As next R* release will most likely switch to zef as installer
of choice.

salortiz/rakudo,MasterDuke17/rakudo,Gnouc/rakudo,lucasbuchala/rakudo,sjn/rakudo,samcv/rakudo,jonathanstowe/rakudo,rakudo/rakudo,salortiz/rakudo,nbrown/rakudo,tony-o/rakudo,MasterDuke17/rakudo,softmoth/rakudo,Gnouc/rakudo,labster/rakudo,softmoth/rakudo,salortiz/rakudo,raydiak/rakudo,rakudo/rakudo,nbrown/rakudo,sjn/rakudo,tbrowder/rakudo,jonathanstowe/rakudo,awwaiid/rakudo,nbrown/rakudo,usev6/rakudo,usev6/rakudo,jonathanstowe/rakudo,lucasbuchala/rakudo,nbrown/rakudo,tony-o/rakudo,usev6/rakudo,MasterDuke17/rakudo,salortiz/rakudo,awwaiid/rakudo,labster/rakudo,samcv/rakudo,samcv/rakudo,MasterDuke17/rakudo,tbrowder/rakudo,Gnouc/rakudo,softmoth/rakudo,awwaiid/rakudo,nbrown/rakudo,sjn/rakudo,lucasbuchala/rakudo,tbrowder/rakudo,usev6/rakudo,raydiak/rakudo,Gnouc/rakudo,MasterDuke17/rakudo,nbrown/rakudo,tony-o/rakudo,rakudo/rakudo,tony-o/rakudo,rakudo/rakudo,Gnouc/rakudo,MasterDuke17/rakudo,labster/rakudo,tony-o/rakudo,Gnouc/rakudo,softmoth/rakudo,tbrowder/rakudo,sjn/rakudo,labster/rakudo,sjn/rakudo,rakudo/rakudo,softmoth/rakudo,samcv/rakudo,jonathanstowe/rakudo,labster/rakudo,salortiz/rakudo,tbrowder/rakudo,samcv/rakudo,tbrowder/rakudo,raydiak/rakudo,usev6/rakudo,rakudo/rakudo,salortiz/rakudo,jonathanstowe/rakudo,awwaiid/rakudo,lucasbuchala/rakudo,tony-o/rakudo,awwaiid/rakudo,raydiak/rakudo,labster/rakudo,lucasbuchala/rakudo