Deprecate distinctState filter with warning message. Bump version to

beta5.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "redux-undo",
-  "version": "1.0.0-beta4",
+  "version": "1.0.0-beta5",
   "description": "simple undo/redo functionality for redux state containers",
   "main": "lib/index.js",
   "scripts": {

src/index.js

@@ -310,6 +310,13 @@ export function isHistory (history) {
 }
 // /isHistory
 
+// distinctState helper
+export function distinctState () {
+  console.warning('distinctState is deprecated in beta4 and newer. The distinctState behavior is now default, which means only actions resulting in a new state are recorded. See https://github.com/omnidan/redux-undo#filtering-actions for more details.')
+  return () => true
+}
+// /distinctState
+
 // includeAction helper
 export function includeAction (rawActions) {
   const actions = parseActions(rawActions)