Relative links in md files don't work if it's in the README.md

Created by: albertsj1

Gitlab allows using relative links in md files to create a link. So, something like link to myfile works fine when viewing a file and clicking on the link; however, if the file you are viewing is a README.md, so it's displayed automatically below the file listing, the link doesn't include the branch, so it's broken. For example, the link is /tree/myfile.md when it should be /tree/master/myfile.md.