Add 4.13.1 change log

Change-Id: I8e0b8f6d002c0251268aff1aeddd3470cfdee140
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>

dist/changes-4.13.1.md

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+Qt Creator 4.13.1
+=================
+
+Qt Creator version 4.13.1 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 origin/v4.13.0..v4.13.1
+
+Editing
+-------
+
+* Fixed whitespace cleaning (QTCREATORBUG-24565)
+* Fixed selection color (QTCREATORBUG-24479)
+
+### C++
+
+* Fixed crash with adjacent raw string literals (QTCREATORBUG-24577)
+
+### QML
+
+* Fixed wrong diagnostics for `ListElement` (QDS-2602)
+
+### Language Client
+
+* Fixed performance issue
+
+Projects
+--------
+
+* Fixed parsing of QTest application output (QTCREATORBUG-24560)
+* Fixed visibility of output in output panes (QTCREATORBUG-24411)
+
+### qmake
+
+* Fixed handling of unset environment variables (QTCREATORBUG-21729)
+
+### CMake
+
+* Fixed removal of CMake tools
+
+### Qbs
+
+* Fixed install step
+
+Debugging
+---------
+
+### GDB
+
+* Fixed disabling of environment variables
+
+Analyzer
+--------
+
+### Clang
+
+* Updated Clazy to version 1.7
+
+Qt Quick Designer
+-----------------
+
+* Improved composition of custom materials (QDS-2657)
+* Fixed available items for MCU (QDS-2681, QDS-2512)
+* Fixed visual artifacts when changing states
+* Fixed rich text editor styling
+* Fixed layout issues in state editor (QDS-2623, QDS-2615)
+* Fixed support for `.hrd` images (QDS-2128)
+
+Platforms
+---------
+
+### Android
+
+* Fixed service handling in manifest editor (QTCREATORBUG-24557)
+
+### macOS
+
+* Fixed Clazy (QTCREATORBUG-24567)
+
+Credits for these changes go to:
+--------------------------------
+Aleksei German  
+André Pönitz  
+Andy Shaw  
+Christian Kandeler  
+Christian Stenger  
+David Schulz  
+Dominik Holland  
+Eike Ziller  
+Henning Gruendl  
+Johanna Vanhatapio  
+Kai Köhne  
+Knud Dollereder  
+Leena Miettinen  
+Mahmoud Badri  
+Marco Bubke  
+Michael Winkelmann  
+Miikka Heikkinen  
+Orgad Shaneh  
+Sergey Belyashov  
+Thomas Hartmann  
+Venugopal Shivashankar  
+Vikas Pachdha  
+Ville Voutilainen