Upgrade dependencies

Author: welbert

package.json

@@ -35,7 +35,7 @@
     "commander": "^2.9.0",
     "express": "^4.15.2",
     "gm": "^1.23.0",
-    "selenium-webdriver": "3.3.0",
+    "selenium-webdriver": "3.4.0",
     "showdown": "^1.6.4",
     "vm2": "3.4.6",
     "wkhtmltopdf": "^0.3.4"