[gnome-music/wip/mschraal/readme-MR] README: Add bit about merge requests

[Marinus Schraal <mschraal src gnome org>]

commit 4931d16bc39a1ea63a097e09a139b123f5e7cc0f
Author: Marinus Schraal <mschraal gnome org>
Date:   Sat Sep 15 13:32:48 2018 +0200

    README: Add bit about merge requests
    
    Ask contributors to enable maintainer commits on merge requests.

 README.md | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
---
diff --git a/README.md b/README.md
index bd120024..e6e6d9cc 100644
--- a/README.md
+++ b/README.md
@@ -176,4 +176,8 @@ Problem in some detail.
 Implemented fix.
 
 Closes: #issuenr
->>>
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+>>>
+
+## Merge requests
+
+When opening a Merge Request, please enable the [_'Allow commits from members who can merge to the target 
branch'_](https://docs.gitlab.com/ee/user/project/merge_requests/allow_collaboration.html) checkbox. This 
allows the Music maintainer the help out on the Merge Request as needed.
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