Update README.md

Author: learning-zone

jwt-authentication/README.md

@@ -1,7 +1,7 @@
-## Express and JSON Web Token Authentication
+# Express and JSON Web Token Authentication
 
 
-#### Generate Random Access Token
+## Generate Random Access Token
 
 ```bash
 node > require('crypto').randomBytes(64).toString('hex');
@@ -10,3 +10,7 @@ node > require('crypto').randomBytes(64).toString('hex');
 
 'e366bb13beebb0b9c8611dca7dc13d4badf7f303c374151cab5dfbb21196dede06224b3a210fdbd6f9392ac906b0f0662ff3480ea62c6374078928af177db161'
 ```
+
+## Reference
+
+* *[https://github.com/auth0/node-jsonwebtoken#readme](https://github.com/auth0/node-jsonwebtoken#readme)*