Fix typo in changelog

Author: dunglas

CHANGELOG.md

@@ -4,7 +4,7 @@
 
 * Add support for deprecating resources, operations and fields in GraphQL, Hydra and Swagger
 * Add API Platform panels in the Symfony profiler and in the web debug toolbar
-* Make resource class's constructor parameters writables
+* Make resource class's constructor parameters writable
 * Add support for interface as a resource
 * Add a shortcut syntax to define attributes at the root of `@ApiResource` and `@ApiProperty` annotations
 * Throw an exception if a required filter isn't set