Add changes file for 4.7.2

Change-Id: I042c29592b46a4f094251d241dba442bc4d728c6
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>

dist/changes-4.7.2.md

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+Qt Creator version 4.7.2 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/v4.7.1..v4.7.2
+
+Editing
+
+* Fixed that collapsed text no longer showed up in tooltip (QTCREATORBUG-21040)
+* Fixed crash with generic text completion (QTCREATORBUG-21192)
+
+C++ Support
+
+* Fixed wrong value of `__cplusplus` define (QTCREATORBUG-20884)
+* Clang Code Model
+    * Fixed possible crash in `Follow Symbol Under Cursor`
+    * Fixed crash when using `Select Block Up/Down` with lambda
+      (QTCREATORBUG-20994)
+
+Debugging
+
+* CDB
+    * Fixed pretty printing of `std::vector` without Python (QTCREATORBUG-21074)
+
+Platform Specific
+
+Windows
+
+* Fixed saving of files when another application blocks atomic save operation
+  (QTCREATORBUG-7668)
+
+Remote Linux
+
+* Fixed superfluous empty lines in application output (QTCREATORBUG-19367)
+
+Credits for these changes go to:  
+David Schulz  
+Eike Ziller  
+Friedemann Kleint  
+Hannes Domani  
+Ivan Donchevskii  
+Jonathan Liu  
+Kai Köhne  
+Nikolai Kosjar  
+Sergey Belyashov