update

package.json

@@ -18,14 +18,13 @@
   },
   "dependencies": {
     "@riophae/vue-treeselect": "0.0.38",
-    "axios": ">=0.18.1",
+    "axios": "^0.19.0",
     "clipboard": "1.7.1",
     "codemirror": "^5.38.0",
     "connect": "3.6.6",
     "echarts": "4.1.0",
     "element-ui": "^2.11.1",
     "file-saver": "1.3.8",
-    "html2canvas": "^1.0.0-rc.3",
     "js-cookie": "2.2.0",
     "jsencrypt": "^3.0.0-rc.1",
     "jszip": "3.1.5",
@@ -34,7 +33,6 @@
     "nprogress": "0.2.0",
     "path-to-regexp": "2.4.0",
     "screenfull": "3.3.3",
-    "simple-drawing-board": "1.4.1",
     "vue": "2.5.17",
     "vue-count-to": "1.0.13",
     "vue-router": "3.1.3",