upgrade main packages to latest version; lock the packages version

package.json

@@ -12,25 +12,25 @@
     "lint": "eslint --ext .js,.vue src"
   },
   "dependencies": {
-    "axios": "^0.17.0",
+    "axios": "^0.17.1",
     "babel-polyfill": "^6.26.0",
-    "browser-detect": "^0.2.18",
-    "echarts": "^3.8.3",
-    "element-ui": "^2.0.5",
+    "browser-detect": "^0.2.22",
+    "echarts": "^3.8.5",
+    "element-ui": "^2.0.9",
     "font-awesome": "^4.7.0",
     "highlight.js": "^9.12.0",
-    "iview": "^2.6.0",
-    "moment": "^2.19.1",
+    "iview": "^2.8.0",
+    "moment": "^2.20.1",
     "papaparse": "^4.3.6",
     "raven-js": "^3.21.0",
     "screenfull": "^3.3.2",
     "simditor": "^2.3.6",
     "simditor-markdown": "^1.1.2",
-    "vue": "^2.5.3",
+    "vue": "^2.5.13",
     "vue-clipboard2": "0.0.7",
-    "vue-codemirror-lite": "^1.0.2",
-    "vue-cropper": "^0.2.5",
-    "vue-echarts": "^2.5.1",
+    "vue-codemirror-lite": "^1.0.3",
+    "vue-cropper": "^0.2.8",
+    "vue-echarts": "^2.6.0",
     "vue-router": "^3.0.1",
     "vuex": "^3.0.1",
     "vuex-router-sync": "^5.0.0"

src/pages/admin/views/general/PruneTestCase.vue

@@ -9,7 +9,7 @@
       </span>
       <el-table :data="data">
         <el-table-column
-          label="Create Time">
+          label="Last Modified">
           <template slot-scope="{row}">
             {{row.create_time | timestampFormat }}
           </template>

src/pages/oj/views/problem/ProblemList.vue

@@ -53,7 +53,7 @@
     <Panel :padding="10">
       <div slot="title" class="taglist-title">Tags</div>
       <Button v-for="tag in tagList"
-              key="tag"
+              :key="tag.name"
               @click="filterByTag(tag.name)"
               type="ghost"
               :disabled="query.tag === tag.name"