Version bump and readme update

Author: mary-prince

README.md

@@ -32,6 +32,10 @@ Generate validating forms from JSON schemas.
 
 # Changelog
 
+## 4.0.0
+
+* Add settings parameter for custom formats validation.
+
 ## 3.0.0
 
 * Validate fields only when `onblur` is triggered, and the field is non-empty

elm.json

@@ -3,7 +3,7 @@
     "name": "scrive/elm-json-forms",
     "summary": "JSON Forms Implementation in Elm.",
     "license": "MIT",
-    "version": "3.0.0",
+    "version": "4.0.0",
     "exposed-modules": [
         "Form",
         "Form.Widget",