Bump express-jwt from 5.1.0 to 6.0.0

Bumps [express-jwt](https://github.com/auth0/express-jwt) from 5.1.0 to 6.0.0.
- [Release notes](https://github.com/auth0/express-jwt/releases)
- [Changelog](https://github.com/auth0/express-jwt/blob/master/CHANGELOG.md)
- [Commits](auth0/express-jwt@v5.1.0...v6.0.0)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package.json

@@ -16,7 +16,7 @@
     "enzyme": "2.9.1",
     "express": "4.14.0",
     "express-graphql": "0.6.1",
-    "express-jwt": "5.1.0",
+    "express-jwt": "6.0.0",
     "extend": "3.0.2",
     "fastclick": "1.0.6",
     "fbjs": "0.8.6",