up tree selected style

package.json

@@ -58,7 +58,7 @@
     "rc-table": "~3.1.0",
     "rc-tabs": "~5.3.2",
     "rc-tooltip": "~2.6.4",
-    "rc-tree": "~0.15.1",
+    "rc-tree": "~0.15.2",
     "rc-upload": "~1.3.1",
     "rc-util": "~2.0.3",
     "react-slick2": "~0.6.6",

style/components/tree.less

@@ -100,6 +100,9 @@
       color: gray;
     }
   }
+  &-node-selected {
+    background-color: tint(@primary-color, 90%);
+  }
   &-icon__open {
     margin-right: 2px;
     vertical-align: top;