Update express dependency version to >=4.20.0

Author: WirelessLife

archive/Educator Resources/Course Content/Module2/code/lesson6/Lab/package.json

@@ -19,11 +19,12 @@
   "dependencies": {
     "azure-storage": "^1.0.1",
     "body-parser": "1.9.2",
-    "express": "4.10.1",
+    "express": ">=4.20.0",
     "morgan": "1.9.1"
   },
   "devDependencies": {
     "expect.js": "0.3.1",
+    "express": ">=4.20.0",
     "mocha": "2.5.3",
     "superagent": ">=3.7.0"
   }