cfg/qt.cfg - add definition for QDate::isValid()

Add the bool isValid() signature.
bool isValid(int, int, int) is already there.

Author: winterz

cfg/qt.cfg

@@ -2728,6 +2728,12 @@
     <use-retval/>
     <const/>
   </function>
+  <function name="QDate::isValid">
+    <noreturn>false</noreturn>
+    <returnValue type="bool"/>
+    <use-retval/>
+    <const/>
+  </function>
   <!-- bool QDate::isValid() const -->
   <!-- bool QDate::isValid(int year, int month, int day) // static -->
   <function name="QDate::isValid">