utf8 cpp library
Release 2.2.4

This is a minor bug fix release that improves converting from utf-16 to utf-8 error detection.

Changes from version 2.2.3
- Bug fix [2857454]	dereference invalid iterator when lead surrogate was last element of the string.

Files included in the release: utf8.h, core.h, checked.h, unchecked.h, utf8cpp.html, ReleaseNotes
