Changes with IDN 0.1.5 (2022-11-16)

* Minor updates to support compilation of M1 silicon.

Changes with IDN 0.1.4 (2021-11-02)

* nfkc_normalize raises ArgumentError instead of returning nil for
  invalid utf-8 strings.

Changes with IDN 0.1.3 (2021-11-01)

* Fixed segv in latest ruby-head with bad utf-8

Changes with IDN 0.1.2 (2021-06-10)

* add missing includes
* fix default encoding to use utf8

Changes with IDN 0.1.1 [yanked] (2021-06-09)

* Use xfree() only with memory allocated with xmalloc()/xrealloc(). Free
  IDN-allocated memory with idn_free()

Changes with IDN 0.1.0 (2011-03-31)

* Fix compilation errors in ruby 1.9.2p0 (2010-08-18 revision 29036).

Changes with IDN 0.0.2 (2006-02-11)

* Remove excessive xfree() if a call to stringprep_profile() returns an
  error. Fixes crash reported in PR #3088.

* Add tests for invalid Stringprep strings and adjust names of already
  existing test methods.

* Improve existing tests for IDN::Idna.

Changes with IDN 0.0.1 (2005-09-26)

* First release.