Changelog: add entry for PR #103: fix handling of border.rectList with PySide6 backend

Author: PierreRaybaut

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 - Fixed [Issue #100](https://github.com/PlotPyStack/PythonQwt/issues/100) - TypeError in `QwtSymbol.drawSymbol` method due to outdated `renderSymbols` call
 - Fixed [Issue #101](https://github.com/PlotPyStack/PythonQwt/issues/101) - `RuntimeWarning: overflow encountered in cast` when plotting `numpy.float32` curve data
+- Merged [PR #103](https://github.com/PlotPyStack/PythonQwt/pull/103): [FIX] wrong handling of `border.rectList` with PySide6 backend - thanks to @martinschwinzerl
 
 ## Version 0.14.5