Give IO::Handle.read default size
Give IO::Handle.read default size

To make consistent with .readchars.
Per https://irclog.perlgeek.de/perl6-dev/2017-06-13#i_14728193

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