Relative links in the README file shown on the repository homepage should point

to the default branch, not to master

CHANGELOG

@@ -39,6 +39,7 @@ v 8.2.0 (unreleased)
   - Improve Continuous Integration graphs page
   - Make color of "Accept Merge Request" button consistent with current build status
   - Add ignore white space option in merge request diff and commit and compare view
+  - Relative links from a repositories README.md now link to the default branch
 
 v 8.1.4
   - Fix bug where manually merged branches in a MR would end up with an empty diff (Stan Hu)

lib/gitlab/markdown/relative_link_filter.rb

@@ -51,7 +51,7 @@ module Gitlab
           relative_url_root,
           context[:project].path_with_namespace,
           path_type(file_path),
-          ref || 'master',  # assume that if no ref exists we can point to master
+          ref || context[:project].default_branch,  # if no ref exists, point to the default branch
           file_path
         ].compact.join('/').squeeze('/').chomp('/')