Add changes file for 4.14.2

Change-Id: Iaec33f8ffa103c335070ec363b9943fcbde86432
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>

dist/changes-4.14.2.md

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+Qt Creator 4.14.2
+=================
+
+Qt Creator version 4.14.2 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 origin/v4.14.1..v4.14.2
+
+General
+-------
+
+### Building Qt Creator with CMake
+
+* Fixed installation location of desktop and appstream files
+
+Help
+----
+
+* Fixed crash with `Previous/Next Open Document in History` (QDS-3743)
+
+Editing
+-------
+
+* Re-added generic highlighting for Autoconf files (QTCREATORBUG-25391)
+
+Debugging
+---------
+
+### LLDB
+
+* Fixed performance issue (QTCREATORBUG-25185, QTCREATORBUG-25217)
+
+Platforms
+---------
+
+### macOS
+
+* Fixed vanishing controls in Welcome mode in Dark Mode (QTCREATORBUG-25405)
+
+Credits for these changes go to:
+--------------------------------
+Alessandro Portale  
+Christian Stenger  
+Christophe Giboudeaux  
+David Schulz  
+Eike Ziller  
+Heiko Becker  
+Ivan Komissarov  
+Miikka Heikkinen  
+Robert Löhning