.hgtags: add tag for release.r58.1.
.hgtags: add tag for release.r58.1.

TBR=r
CC=golang-dev
http://codereview.appspot.com/4711042

mwitkow-io/protobuf,velocity-toolkit/protobuf-1,linkedin-inc/protobuf,skyportsystems/go-protobuf,hailocab/protobuf,aoeu/protobuf,tamird/protobuf-2,tamird/protobuf-2,fuchsia-mirror/third_party-github.com-golang-protobuf,francoishill/protobuf,ArtemTeleshev/go-protobuf,skyportsystems/go-protobuf,jmptrader/protobuf-1,fuchsia-mirror/third_party-github.com-golang-protobuf,adnaan/protobuf,qinlodestar/protobuf,kung-foo/protobuf,trdata/protobuf,golang/protobuf,trdata/protobuf,golang/protobuf,eduardiazf/protobuf,jeremyletang/protobuf,csuideal/protobuf,alskjstl/protobuf,daemonl/protobuf,ekle/protoc-gen-goweb_test,ekle/protoc-gen-goweb,jrbarron/protobuf