c-ares [skip ci]

LICENSE.txt

@@ -1343,6 +1343,27 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 --------------------------------------------------------------------------------
 
+3rdparty dependency c-ares is statically linked in certain binary
+distributions, like the python wheels. c-ares has the following license:
+
+# c-ares license
+
+Copyright (c) 2007 - 2018, Daniel Stenberg with many contributors, see AUTHORS
+file.
+
+Copyright 1998 by the Massachusetts Institute of Technology.
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for any purpose and without fee is hereby granted, provided that
+the above copyright notice appear in all copies and that both that copyright
+notice and this permission notice appear in supporting documentation, and that
+the name of M.I.T. not be used in advertising or publicity pertaining to
+distribution of the software without specific, written prior permission.
+M.I.T. makes no representations about the suitability of this software for any
+purpose.  It is provided "as is" without express or implied warranty.
+
+--------------------------------------------------------------------------------
+
 This project includes code from the rtools-backports project.
 
 * ci/PKGBUILD and ci/appveyor-build-r.sh are based on code