CHANGELOG.md in attributor-5.7 vs CHANGELOG.md in attributor-6.0

@@ -1,6 +1,13 @@
 # Attributor Changelog
 
+## next
+
+## 6.0 (22/11/2021)
+- removed `required_if` support and all of the necessary code. 
+- changed the semantics of the `required:` option in attributes, to really mean if the "key" is required to be passed in or not (i.e., check if the key is null, not if its value is null)
+- Introduced a new option`null: true|false` to allow for the value of an attribute to be nullable or not when the attribute is passed in.
+  * The default behavior for an attribute nullability currently `null: false` (but it can be easily changed by overriding the `Attributor::Attribute.default_for_null` function to return `true`)
 ## 5.7 (1/7/2021)
 
 - added `custom_option` to Attributor::Attribute class, accepting a name and Attribute arguments that will be used to validate the option value(s) provided.
 
 ## 5.6 (11/02/2020)