update version

Author: PanJiaChen

package.json

@@ -44,7 +44,7 @@
   },
   "dependencies": {
     "axios": "0.18.0",
-    "clipboard": "1.7.1",
+    "clipboard": "2.0.4",
     "codemirror": "5.45.0",
     "driver.js": "0.9.5",
     "dropzone": "5.5.1",
@@ -58,7 +58,7 @@
     "normalize.css": "7.0.0",
     "nprogress": "0.2.0",
     "path-to-regexp": "2.4.0",
-    "screenfull": "4.1.0",
+    "screenfull": "4.2.0",
     "showdown": "1.9.0",
     "sortablejs": "1.8.4",
     "tui-editor": "1.3.3",