Libidn 2.2.0 (released 2019-05-23)

• Perform A-Label roundtrip for lookup functions by default
• Stricter check of input to punycode decoder
• Fix punycode decoding with no ASCII chars but given delimiter
• Fix idn2 --no-tr64 (was a no-op)
• Allow _ as a basic code point in domain labels
• Fail building documentation if ronn isn't installed
• git tag changed to reflect https://semver.org/

Libidn 2.1.1 (released 2019-02-08)

• Revert SONAME bump from release 2.1.0
• Fix NULL dereference in idn2_register_u8() and idn2_register_ul()
• Fix free of random value in idn2_to_ascii_4i()
• Improved fuzzer (which found the above issues)
• Fix printf() crash in test-lookup.c on Solaris
• Check for valid unicode input in punycode encoder
• Avoid excessive CPU usage in punycode encoding with large inputs
• Deprecate idn2_to_ascii_4i() in favor of idn2_to_ascii_4i2()
• Restrict output length of idn2_to_ascii_4i() to 63 bytes

Libidn 2.1.0 (released 2019-01-04)

• Two exposed functions are no longer exposed: _idn2_punycode_encode() and _idn2_punycode_decode() which were meant to be used internally only. The output needs additional checks to be used safely. This is the reason to for the SONAME bump, just in case.
• Fix label length check for idn2_register_u8()
• Remove compiler warnings
• Use gnulib-python tool for bootstrapping if possible
• Improve build system (several small issues)
• Add missing error messages to idn2_strerror_name()
• Improve docs and remove typos
• Update gnulib