Add change log entry

Author: oschwald

HISTORY.rst

@@ -10,6 +10,10 @@ History
 * The extension source directory was moved to prevent an ``ImportWarning``
   when importing the module on Python 2 with ``-Wdefault`` set. Reported by
   David Szotten and Craig de Stigter. GitHub #31.
+* The ``get`` method now accepts ``ipaddress.IPv4Address`` and
+  ``ipaddress.IPv6Address`` objects in addition to strings.  This works with
+  both the pure Python implementation as well as the extension. Based on a
+  pull request #48 by Eric Pruitt. GitHub #50.
 
 1.4.1 (2018-06-22)
 ++++++++++++++++++