Added CHANGELOG item

CHANGELOG

@@ -61,6 +61,7 @@ v 8.7.0 (unreleased)
   - API: User can leave a project through the API when not master or owner. !3613
   - Fix repository cache invalidation issue when project is recreated with an empty repo (Stan Hu)
   - Fix: Allow empty recipients list for builds emails service when pushed is added (Frank Groeneveld)
+  - Improved markdown forms
 
 v 8.6.6
   - Fix error on language detection when repository has no HEAD (e.g., master branch). !3654 (Jeroen Bobbeldijk)

app/assets/stylesheets/pages/note_form.scss

@@ -64,7 +64,7 @@
 
     &.is-focused {
       border-color: $focus-border-color;
-      box-shadow: 0 0 2px rgba(#000, .2),
+      box-shadow: 0 0 2px $black-transparent,
                   0 0 4px rgba($focus-border-color, .4);
 
       .comment-toolbar,
@@ -75,7 +75,7 @@
 
     &.is-dropzone-hover {
       border-color: $gl-success;
-      box-shadow: 0 0 2px rgba(#000, .2),
+      box-shadow: 0 0 2px $black-transparent,
                   0 0 4px rgba($gl-success, .4);
 
       .comment-toolbar,