message: update third_party.md
diff: ### SDL CORE
  -Copyright (C) 2018 SmartDeviceLink Consortium, Inc.
  +Copyright (C) 2018 - 2020, SmartDeviceLink Consortium, Inc.
  #### License
  -Copyright (c) 2017 - 2018, SmartDeviceLink Consortium, Inc.
  +Copyright (c) 2017 - 2020, SmartDeviceLink Consortium, Inc.
  All rights reserved.
  Redistribution and use in source and binary forms, with or without
  @@ -41,12 +41,11 @@ The third party software included and used by this project is:
  * The library is included in the Google Mock class generator
  * See [https://github.com/google/googletest/tree/master/googlemock](https://github.com/google/googletest/tree/master/googlemock)
  -**json-cpp 0.6.0 rc2**
  +**json-cpp 1.9.2**
  -* Copyright (c) 2007-2010 Baptiste Lepilleur
  -* Licensed under MIT License
  -* The library is included in jsoncpp 3rd party static src folder
  -* See [https://github.com/open-source-parsers/jsoncpp/releases/tag/svn-release-0.6.0-rc2](https://github.com/open-source-parsers/jsoncpp/releases/tag/svn-release-0.6.0-rc2)
  +* Any copyright is dedicated to the Public Domain
  +* The library is included as a git submodule in jsoncpp 3rd party static src folder
  +* See [https://github.com/open-source-parsers/jsoncpp/releases/tag/1.9.2](https://github.com/open-source-parsers/jsoncpp/releases/tag/1.9.2)
  **Apache log4cxx 0.10.0**
  