CONTRIBUTING.md: Missing serial comma

[ci skip]

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 170bf62c6c3c5d21428454d3688f13dea6db1734..8d65f9984f59a1b32955688eda12837b6518755a 100644 (file)
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -153,7 +153,7 @@ project (indentation, accurate comments, etc.) and any other requirements
 **Do not edit `bootstrap.css`, `bootstrap-theme.css`, or `bootstrap.js`
 directly!** Those files are automatically generated. You should edit the
 source files in [`/bootstrap/less/`](https://github.com/twbs/bootstrap/tree/master/less),
-[`/bootstrap/scss/`](https://github.com/twbs/bootstrap/tree/v4-dev/scss) (for Bootstrap v4)
+[`/bootstrap/scss/`](https://github.com/twbs/bootstrap/tree/v4-dev/scss) (for Bootstrap v4),
 and/or [`/bootstrap/js/`](https://github.com/twbs/bootstrap/tree/master/js) instead.
 
 Similarly, when contributing to Bootstrap's documentation, you should edit the