fix: package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/npm:hoek:20180212
- https://snyk.io/vuln/npm:hoek:20180212

Latest report for coralproject/talk:
https://snyk.io/test/github/coralproject/talk

package.json

@@ -117,9 +117,9 @@
     "inquirer": "^3.2.2",
     "inquirer-autocomplete-prompt": "^0.12.1",
     "ioredis": "3.1.4",
-    "joi": "^10.6.0",
+    "joi": "^13.0.0",
     "json-loader": "^0.5.7",
-    "jsonwebtoken": "^7.4.3",
+    "jsonwebtoken": "^8.0.0",
     "jwt-decode": "^2.2.0",
     "keymaster": "^1.6.2",
     "kue": "0.11.6",