Add release notes for 7.4.1 & add EntityDocument::clear to 8.0.0

Author: addshore

RELEASE-NOTES.md

@@ -13,11 +13,16 @@ This release removes integers as acceptable entity IDs.
   `hasElement`, `hasElementHash`, `hasValidType`, `preSetElement`, `removeByElementHash`,
   `removeElement`, and `setElement`.
 * Added periods to the list of disallowed characters in `RepositoryNameAssert`.
+* Added `EntityDocument::clear`
 
 #### Other changes
 * Un-deprecated several sitelink related shortcuts from `Item`: `addSiteLink`, `getSiteLink`,
   `hasLinkToSite`, and `removeSiteLink`.
 
+## Version 7.4.1 (2018-05-02)
+
+* Removed `clear` from `EntityDocument`. This was a compatibility break of the interface.
+
 ## Version 7.4.0 (2018-05-02)
 
 * Added `clear` to `EntityDocument`