Bump Axios to ^0.21.1 (#208)

This version fixes an SSRF vulnerability:

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-28168

The changelog since 0.20.0 seems reasonable:

https://github.com/axios/axios/blob/a64050a6cfbcc708a55a7dc8030d85b1c78cdf38/CHANGELOG.md#0211-december-21-2020

Closes #200.

Author: 72636c

package-lock.json

@@ -6,7 +6,7 @@
   "types": "index.d.ts",
   "dependencies": {
     "@types/express-jwt": "0.0.42",
-    "axios": "^0.20.0",
+    "axios": "^0.21.1",
     "debug": "^4.1.0",
     "http-proxy-agent": "^4.0.1",
     "https-proxy-agent": "^5.0.0",