Add changelog for 5.3.1
Add changelog for 5.3.1

Change-Id: I5b3fb1c9e6b91bcf58b72f6e380c3cd580674f3c
Reviewed-by: Frederik Gladhorn <bb2d0c2ba681c116a2d12cf46ffa528dd5dd064e@digia.com>
Reviewed-by: J-P Nurmi <b84a892f57a298bb5dae653b4e188948a84d5549@digia.com>

mizukusak/qtquickcontrols,mizukusak/qtquickcontrols,mizukusak/qtquickcontrols