Update the Changelog.

CHANGELOG

-v 7.8.0 (unreleased)
+v 7.8.2
+  - Fix service migration issue when upgrading from versions prior to 7.3
+  - Fix setting of the default use project limit via admin UI
+  - Fix showing of already imported projects for GitLab and Gitorious importers
+  - Fix response of push to repository to return "Not found" if user doesn't have access
+  - Fix check if user is allowed to view the file attachment
+
+v 7.8.1
+  - Fix run of custom post receive hooks
+  - Fix migration that caused issues when upgrading to version 7.8 from versions prior to 7.3
+  - Fix the warning for LDAP users about need to set password
+  - Fix avatars which were not shown for non logged in users
+  - Fix urls for the issues when relative url was enabled
+
+v 7.8.0
   - Fix access control and protection against XSS for note attachments and other uploads.
   - Replace highlight.js with rouge-fork rugments (Stefan Tatschner)
   - Make project search case insensitive (Hannes Rosenögger)