update menu style and version

package.json

@@ -45,7 +45,7 @@
     "rc-dropdown": "~1.3.3",
     "rc-form-validation": "~2.4.7",
     "rc-input-number": "~2.0.1",
-    "rc-menu": "~4.4.2",
+    "rc-menu": "~4.5.0",
     "rc-notification": "~1.1.0",
     "rc-pagination": "~1.1.0",
     "rc-progress": "~1.0.0",

style/components/menu.less

@@ -10,6 +10,7 @@
   box-shadow: @overlay-shadow;
   border-radius: @border-radius-base;
   color: @text-color;
+  background: #fff;
 
   &-item-group-list {
     margin: 0;