[Release v2.2.1] QArchive v2.2.1 release.

This release gives improved support for Qt6 and other
minro bugfixes.

* Improved Support for building with Qt6.

* Fixes build errors in Windows with Qt6.

* Credits for Qt6 support: @DeuxVis, @lmussier, and
  @neheb

CMakeLists.txt

@@ -5,7 +5,7 @@
 # -------------------------------
 
 CMAKE_MINIMUM_REQUIRED( VERSION 3.17)
-project(QArchive VERSION 2.2.0)
+project(QArchive VERSION 2.2.1)
 
 set(CMAKE_CXX_STANDARD 11)
 set(CMAKE_INCLUDE_CURRENT_DIR ON)