Make DataModel usable in Wikibase again

This by reverting the ClearableEntity change which is causing the problems.

See https://phabricator.wikimedia.org/T206325

Author: JeroenDeDauw

README.md

@@ -29,12 +29,12 @@ the git repository and take care of loading yourself.
 To add this package as a local, per-project dependency to your project, simply add a
 dependency on `wikibase/data-model` to your project's `composer.json` file.
 Here is a minimal example of a `composer.json` file that just defines a dependency on
-Wikibase DataModel 8.x:
+Wikibase DataModel 9.x:
 
 ```js
 {
     "require": {
-        "wikibase/data-model": "~8.0"
+        "wikibase/data-model": "~9.0"
     }
 }
 ```

RELEASE-NOTES.md

@@ -1,7 +1,8 @@
 # Wikibase DataModel release notes
 
-## Version 8.1.0 (dev)
+## Version 9.0.0 (dev)
 
+* Breaking change: `EntityDocument` no longer extends `ClearableEntity` (8.0.0 revert)
 * The `TermList` constructor now takes any `iterable` instead of just `array`
 * Added `TermList::addAll`
 

composer.json

@@ -49,7 +49,7 @@
 	},
 	"extra": {
 		"branch-alias": {
-			"dev-master": "8.1.x-dev"
+			"dev-master": "9.0.x-dev"
 		}
 	},
 	"scripts": {

src/Entity/EntityDocument.php

@@ -15,7 +15,7 @@
  * @author Jeroen De Dauw < jeroendedauw@gmail.com >
  * @author Bene* < benestar.wikimedia@gmail.com >
  */
-interface EntityDocument extends Comparable, ClearableEntity {
+interface EntityDocument extends Comparable {
 
 	/**
 	 * Returns a type identifier for the entity, e.g. "item" or "property".