add changelog entry for #4768 [ci skip]

Changelog.md

@@ -7,7 +7,7 @@
 * Update image branding to the new decided standard [#4702](https://github.com/diaspora/diaspora/pull/4702)
 * Consistent naming of conversations and messages [#4756](https://github.com/diaspora/diaspora/pull/4756)
 * Improve stream generation time [#4769](https://github.com/diaspora/diaspora/pull/4769)
-
+* Port help pages to backbone [#4768](https://github.com/diaspora/diaspora/pull/4768)
 
 ## Bug fixes
 * Improve time agos by updating the plugin [#4280](https://github.com/diaspora/diaspora/issues/4280)