更新element-ui版本，修复左侧菜单收缩卡顿问题

package.json

@@ -17,7 +17,7 @@
    "axios": "0.17.1",
    "babel-plugin-component": "0.10.1",
    "babel-polyfill": "6.26.0",
    "element-ui": "2.2.1",
    "element-ui": "2.3.2",
    "gulp": "3.9.1",
    "gulp-concat": "2.6.1",
    "gulp-load-plugins": "1.5.0",

src/views/layout/sidebar.vue

@@ -4,6 +4,7 @@
      <el-menu
        :default-active="menuNavActive"
        :collapse="$store.state.sidebarCollapse"
        :collapseTransition="false"
        class="site-sidebar__menu"
        background-color="#545c64"
        text-color="#fff"