Add changes file for Qt 5.12.1

+ ffb63277 Bump version
+ 90ae677b Add changes file for Qt 5.11.3
+ c8530448 Use 127.0.0.1 for redirect URI
+ c6d51bdf

 Bump version

Change-Id: Ie963030517993612e9dc21064bea48ba621f781d
Reviewed-by: Samuel Gaist <samuel.gaist@idiap.ch>
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>
Reviewed-by: Jesus Fernandez <Jesus.Fernandez@qt.io>

dist/changes-5.12.1

+Qt 5.12.1 is a bug-fix release. It maintains both forward and backward
+compatibility (source and binary) with Qt 5.12.0.
+
+For more details, refer to the online documentation included in this
+distribution. The documentation is also available online:
+
+http://doc.qt.io/qt-5/index.html
+
+The Qt version 5.12 series is binary compatible with the 5.11.x series.
+Applications compiled for 5.11 will continue to run with 5.12.
+
+Some of the changes listed in this file include issue tracking numbers
+corresponding to tasks in the Qt Bug Tracker:
+
+https://bugreports.qt.io/
+
+Each of these identifiers can be entered in the bug tracker to obtain more
+information about a particular change.
+
+****************************************************************************
+*                                 General                                  *
+****************************************************************************
+
+ - Use 127.0.0.1 in place of localhost for redirect URI following RFC 8252.