Merge branch 'changelog-description' into 'master'

Changelog description

Please merge before tomorrow.

See merge request !1491

CHANGELOG

-Note: The upcoming release contains empty lines to reduce the number of merge conflicts, scroll down to see past releases.
+Note: The upcoming release below contains empty lines.
+This helps to reduce the number of merge conflicts.
+Scroll down to see the released versions of GitLab.
+Please pick a random empty line to add new content.
 
-v 7.8.0
+v 7.8.0 (unreleased)
   - Replace highlight.js with rouge-fork rugments (Stefan Tatschner)
   - Make project search case insensitive (Hannes Rosenögger)
   - Include issue/mr participants in list of recipients for reassign/close/reopen emails

CONTRIBUTING.md

@@ -63,7 +63,7 @@ If you can, please submit a merge request with the fix or improvements including
 1. Fork the project on GitLab Cloud
 1. Create a feature branch
 1. Write [tests](README.md#run-the-tests) and code
-1. Add your changes to the [CHANGELOG](CHANGELOG) insert your line at a [random point](doc/workflow/gitlab_flow.md#do-not-order-commits-with-rebase) in the current version
+1. Add your changes to the [CHANGELOG](CHANGELOG)
 1. If you are changing the README, some documentation or other things which have no effect on the tests, add `[ci skip]` somewhere in the commit message
 1. If you have multiple commits please combine them into one commit by [squashing them](http://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)
 1. Push the commit to your fork