fix(deps): update dependency argparse to v2 (#93)

Co-authored-by: Stanley Cheung <[email protected]>

Author: renovate-bot

cloudprober/package.json

@@ -5,7 +5,7 @@
   "main": "index.js",
   "dependencies": {
     "@google-cloud/error-reporting": "^2.0.0",
-    "argparse": "^1.0.10",
+    "argparse": "^2.0.0",
     "bluebird": "^3.5.2",
     "google-auth-library": "^7.0.0",
     "google-protobuf": "^3.6.1",