bump to 2.4.8
bump to 2.4.8

ruby-protobuf/protobuf,film42/protobuf,zanker/protobuf,lookout/protobuffy,brianstien/protobuf,localshred/protobuf,localshred/protobuf,brianstien/protobuf,zanker/protobuf,lookout/protobuffy,quixoten/protobuf,film42/protobuf,quixoten/protobuf,ruby-protobuf/protobuf