Add changes file for 3.4.1

Change-Id: Ic43e8d255ee36aa579c8a76da22e156346713dfa
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@theqtcompany.com>

dist/changes-3.4.1.md

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+Qt Creator version 3.4.1 contains bug fixes.
+
+The most important changes are listed in this document. For a complete
+list of changes, see the Git log for the Qt Creator sources that
+you can check out from the public Git repository. For example:
+
+    git clone git://code.qt.io/qt-creator/qt-creator.git
+    git log --cherry-pick --pretty=oneline v3.4.0..v3.4.1
+
+General
+
+* Fixed that disabling some plugins could disable the plugin
+  management UI for most plugins
+
+Editing
+
+* Fixed that CSS files were opened in C++ editor (QTCREATORBUG-14334)
+* Fixed that the completion popup could become huge
+  (QTCREATORBUG-14331)
+
+Project Management
+
+* Fixed adding static libraries with `Add Library` wizard
+  (QTCREATORBUG-14382)
+
+CMake Projects
+
+* Fixed parsing of C++ flags for Ninja projects
+
+Debugging
+
+* Fixed that executables starting with `lldb-platform-` were detected
+  as debugger (QTCREATORBUG-14309)
+* Fixed attaching to running debug server when developing
+  cross-platform (QTCREATORBUG-14412)
+* CDB
+    * Fixed that stepping into frame without source would step out
+      instead (QTCREATORBUG-9677)
+
+C++ Support
+
+* Added completion for `override` and `final` (QTCREATORBUG-11341)
+* Fixed completion after comments starting with `///`
+  (QTCREATORBUG-8597)
+
+QML Support
+
+* Fixed completion for QtQml and QtQml.Models (QTCREATORBUG-13780)
+
+Platform Specific
+
+BareMetal
+
+* Fixed issues when moving from Qt Creator 3.3 to Qt Creator 3.4