Adjusted release date in project readme

Author: JanKallman

src/EPPlus/EPPlus.csproj

@@ -559,7 +559,7 @@
 			A list of fixed issues can be found here https://epplussoftware.com/docs/7.0/articles/fixedissues.html
 
 			Version history
-			8.5.1			20260306 Minor bug fixes. See https://epplussoftware.com/Developers/MinorFeaturesAndIssues
+			8.5.1			20260330 Minor bug fixes. See https://epplussoftware.com/Developers/MinorFeaturesAndIssues
 			8.5.0			20260306 Minor features and bug fixes.
 			8.4.2			20260204 Minor bug fixes.
 			8.4.1			20260112 Minor bug fixes.