Add an Erlang project, gpb, to third_party.md
diff --git a/docs/third_party.md b/docs/third_party.md
index 021cc56..935deab 100644
--- a/docs/third_party.md
+++ b/docs/third_party.md
@@ -36,6 +36,7 @@
* Erlang: http://piqi.org/
* Erlang: https://code.google.com/p/protoc-gen-erl/
* Erlang: https://github.com/basho/erlang_protobuffs
+* Erlang: https://github.com/tomas-abrahamsson/gpb
* Go: https://github.com/golang/protobuf (Google-official implementation)
* Go: http://code.google.com/p/goprotobuf/
* Go: https://github.com/akunspy/gopbuf
