Bump lodash from 2.4.2 to 4.17.15

Bumps [lodash](https://github.com/lodash/lodash) from 2.4.2 to 4.17.15.
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](https://github.com/lodash/lodash/compare/2.4.2...4.17.15)
Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -11,7 +11,7 @@
     "express-session": "~1.0.2",
     "errorhandler": "~1.0.0",
     "compression": "~1.0.1",
-    "lodash": "~2.4.1",
+    "lodash": "~4.17.15",
     "ejs": "~0.8.4"
   },
   "devDependencies": {