README.md in dry-behaviour-0.8.0 vs README.md in dry-behaviour-0.9.0

@@ -98,9 +98,14 @@
 
 @am-kantox, @saverio-kantox & @kantox
 
 ## Changelog
 
+### `0.9.0` :: Warning On Wrong Arity
+
+- many error reporting improvements,
+- warning on wrong arity (declaration, arity 0 / implementation, wrong arity)
+
 ### `0.8.0` :: Implicit Inheritance
 
 - deprecate implicit delegation to the target instance; error message saying “it’ll be removed in 1.0”
 - `implicit_inheritance: true` flag in call to `defprotocol` makes the implementation implicitly inherit the behaviour declared in the core protocol module itself, without the necessity to explicitly call `super`: