update ScalaPB url

docs/third_party.md

@@ -85,7 +85,7 @@ These are projects we know about implementing Protocol Buffers for other program
 * Scala: http://github.com/jeffplaisance/scala-protobuf
 * Scala: http://code.google.com/p/protobuf-scala
 * Scala: https://github.com/SandroGrzicic/ScalaBuff
-* Scala: http://trueaccord.github.io/ScalaPB/
+* Scala: https://scalapb.github.io
 * Swift: https://github.com/alexeyxo/protobuf-swift
 * Swift: https://github.com/apple/swift-protobuf/
 * Vala: https://launchpad.net/protobuf-vala