Add extra padding to README block

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/assets/stylesheets/pages/projects.scss

@@ -546,7 +546,7 @@ pre.light-well {
 .project-show-readme .readme-holder {
   margin-left: -$gl-padding;
   margin-right: -$gl-padding;
-  padding: $gl-padding;
+  padding: ($gl-padding + 7px);
   border-top: 0;
 
   .edit-project-readme {