add gradient top border on bar

modules/Bar.qml

@@ -27,6 +27,18 @@ PanelWindow {
         opacity: M.Theme.barOpacity
     }
 
+    Rectangle {
+        anchors.top: parent.top
+        anchors.left: parent.left
+        anchors.right: parent.right
+        height: 3
+        gradient: Gradient {
+            orientation: Gradient.Horizontal
+            GradientStop { position: 0; color: M.Theme.base0C }
+            GradientStop { position: 1; color: M.Theme.base09 }
+        }
+    }
+
     Item {
         anchors.fill: parent
         anchors.leftMargin: M.Theme.barPadding