doc: Add release notes

bitcoin · Feb 10, 2020 · c7e90ca · c7e90ca
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+P2P and network changes
+-----------------------
+
+- Added NAT-PMP port mapping support via [`libnatpmp`](https://miniupnp.tuxfamily.org/libnatpmp.html)
+
+Command-line options
+--------------------
+
+-  The `-natpmp` option has been added to use NAT-PMP to map the listening port. If both `-natpmp` and `-upnp` options are provided, the former prevails.