Update installation.md

fixed branch-name (5-3 -> 5-4)

Removal of gitlab.socket should be in stop function too. Fix #4313

Fix typo.

Issue 3599: Add snippets_enabled flag to projects for API

Fix PostgreSQL database restoration problem (#4217)

Increase snippet content column size.

Update api.js.coffee

project: allow import via git:// url

Remove gitolite repo check for import script

fix bug when project named: mediawiki

Allow SSH keys to be of type ecdsa rather than only rsa and dsa (which are slower, older, and weaker)

Update app/models/key.rb to permit SSH keys of type ecdsa rather than forcing dsa and rsa algorithms.

Fix Pygments 500 error if lexer not found by name

UI : navbar tooltip position fix when "loading" appears.

Additon of apis for fork administration.

Fix header text for setting greatest team access to a project

Added ability to add and remove the forked from/to relatioinship
between existing repos.

Fix broken API links, fixes #4463

minor contributing guide updates

* issues & pr in English
* appropriate language
* typo & format fix
* not catch all pull request
* update changelog