fix: upgrade express from 4.17.1 to 4.17.2 (#31)

Snyk has created this PR to upgrade express from 4.17.1 to 4.17.2.

See this package in npm:
https://www.npmjs.com/package/express

See this project in Snyk:
https://app.snyk.io/org/davehorton/project/b7e09765-19b2-4aa5-90ba-10432e250041?utm_source=github&utm_medium=referral&page=upgrade-pr

package.json

@@ -27,7 +27,7 @@
     "bent": "^7.3.12",
     "cors": "^2.8.5",
     "debug": "^4.3.3",
-    "express": "^4.17.1",
+    "express": "^4.17.2",
     "form-data": "^2.5.1",
     "form-urlencoded": "^6.0.5",
     "jsonwebtoken": "^8.5.1",