Update third_party.md (#8511)

* Update third_party.md

add https://github.com/thesayyn/protoc-gen-ts as a community maintained protoc typescript compiler.

* sort

docs/third_party.md

@@ -104,6 +104,7 @@ These are projects we know about implementing Protocol Buffers for other program
 * Solidity: https://github.com/celer-network/pb3-gen-sol
 * Swift: https://github.com/alexeyxo/protobuf-swift
 * Swift: https://github.com/apple/swift-protobuf/
+* Typescript: https://github.com/thesayyn/protoc-gen-ts
 * Vala: https://launchpad.net/protobuf-vala
 * Visual Basic: http://code.google.com/p/protobuf-net/