- upgrade libidn

Example/Pods/libidn/README

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+Libidn README -- Important introductory notes.
+Copyright (C) 2002-2015 Simon Josefsson
+See the end for copying conditions.
+
+Libidn is a package for internationalized string handling based on the
+Stringprep, Punycode, IDNA and TLD specifications.  Libidn is a GNU
+project.  See the file COPYING for licensing information.
+
+Read INSTALL for installation instructions, and doc/libidn.* for the
+manual in various formats (including Info, HTML, PostScript, and PDF).
+
+Libidn will not be stable without your help.  Report bugs, proof read
+the manual, or make a monetary donation.
+
+If you need help to use Libidn, or wish to help others, you are
+invited to join our mailing list help-libidn@gnu.org, see
+<https://lists.gnu.org/mailman/listinfo/help-libidn>.
+
+For more information, see <https://www.gnu.org/software/libidn/>.
+
+For any copyright year range specified as YYYY-ZZZZ in this package
+note that the range specifies every single year in that closed interval.
+
+----------------------------------------------------------------------
+Copying and distribution of this file, with or without modification,
+are permitted in any medium without royalty provided the copyright
+notice and this notice are preserved.