Update CHANGELOG.md

Author: garyb

CHANGELOG.md

@@ -12,7 +12,7 @@ Bugfixes:
 
 Other improvements:
 
-## [v5.0.1](https://github.com/purescript-web/purescript-web-xhr/releases/tag/v5.0.1) - 2023-04-20
+## [v5.0.1](https://github.com/purescript-web/purescript-web-xhr/releases/tag/v5.0.1) - 2023-03-20
 
 Bugfixes:
 - Passing `Nothing` for the `filename` parameter to `appendBlob` and `setBlob` has the effect of using the filename from the `File` object, rather than making filename equal to `"null"`. (#23 by @fsoikin)