Update README

Author: rrousselGit

packages/freezed/CHANGELOG.md

@@ -499,7 +499,7 @@ Fixed examples in the README
 
 ## 0.14.1
 
-- Added the ability to customise the JSON value of a union. See https://github.com/rrousselGit/freezed#fromjson---classes-with-multiple-constructors for more information (Thanks to @ookami-kb)
+- Added the ability to customize the JSON value of a union. See https://github.com/rrousselGit/freezed#fromjson---classes-with-multiple-constructors for more information (Thanks to @ookami-kb)
 
 - Fix an issue where Freezed would not generate code properly if `freezed_annotation`
   was indirectly imported (by importing a library that exports `freezed_annotation`) (Thanks to @ookami-kb)