Added entry for I04_1-150

Author: IsabellaRey

docs/release-notes-dev.md

@@ -16,6 +16,7 @@ Changes merged into master
 | I04_1-164 | [#31](https://github.com/DiamondLightSource/PuckBarcodeReader/issues/31) | Patch | Fixed Test Camera button in Options panel |
 | I04_1-144 | [#35](https://github.com/DiamondLightSource/PuckBarcodeReader/issues/35) | Minor | Holder image merged into saved pins image |
 | I04_1-156 | [#37](https://github.com/DiamondLightSource/PuckBarcodeReader/issues/37) | Minor | Messages displayed separately from image |
+| I04_1-150 | [#40](https://github.com/DiamondLightSource/PuckBarcodeReader/issues/40) | Minor | Message displayed for duplicate barcode |
 
 
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