Chainlink VRF (random number) example

See https://docs.chain.link/docs/get-a-random-number/

Set up

1. Clone repo =P
2. npm i
3. cp .env.sample .env
4. Populate .env with a Kovan provider and a private key that has Kovan ETH

Testing

1. Run npx hardhat run scripts/deploy.js
2. Get your deployed contract some LINK: https://faucets.chain.link/kovan
3. Run npx hardhat run scripts/get-random-number.js
4. (in another terminal) Run npx hardhat run scripts/monitor-random-numbers.js
5. Repeat 2 ad infinitum