build: revert selenium-server for CI

Author: yyx990803

package-lock.json

@@ -67,7 +67,7 @@
     "rollup-plugin-node-resolve": "^3.0.0",
     "rollup-plugin-replace": "^2.0.0",
     "rollup-watch": "^4.0.0",
-    "selenium-server": "^3.6.0",
+    "selenium-server": "^2.53.1",
     "typescript": "^2.5.3",
     "uglify-js": "^3.1.3",
     "vue": "^2.4.4",