++++++++++++++++++
* Switch to Apache License 2.0.
* Add NDNApp.get_original_packet_value.
* Improve NDNApp.route and NDNApp.express_interest to give access the
original packet and signature pointers of packets.
* Fix typos in the documentation.
* Support more alternate URI format of Name Component (``seg``, ``off``, ``v``, ``t`` and ``seq``)
* Update Python version to 3.8 and add PyPy 7.2.0 in GitHub Action.
* Fix Name.to_str so its output for ``[b'\x08\x00']`` is correct.