Blockchain: replace video-only link with SavjeeCoin

SavjeeCoin is very simple blockchain implementation to demonstrate the basics
of blockchains. The new link contains both source code and video clip.

Author: jserv

README.md

@@ -61,7 +61,7 @@
 * [**JavaScript**: _A cryptocurrency implementation in less than 1500 lines of code_](https://github.com/conradoqg/naivecoin)
 * [**JavaScript**: _Build your own Blockchain in JavaScript_](https://github.com/nambrot/blockchain-in-js)
 * [**JavaScript**: _Learn & Build a JavaScript Blockchain_](https://medium.com/digital-alchemy-holdings/learn-build-a-javascript-blockchain-part-1-ca61c285821e)
-* [**JavaScript**: _Creating a blockchain with JavaScript_](https://www.youtube.com/watch?v=zVqczFZr124&list=PLzvRQMJ9HDiTqZmbtFisdXFxul5k0F-Q4) [video]
+* [**JavaScript**: _Creating a blockchain with JavaScript_](https://github.com/SavjeeTutorials/SavjeeCoin) [video with code]
 * [**JavaScript**: _How To Launch Your Own Production-Ready Cryptocurrency_](https://hackernoon.com/how-to-launch-your-own-production-ready-cryptocurrency-ab97cb773371)
 * [**Python**: _Learn Blockchains by Building One_](https://hackernoon.com/learn-blockchains-by-building-one-117428612f46)
 * [**Python**: _Build your own blockchain: a Python tutorial_](http://ecomunsing.com/build-your-own-blockchain)