Testnet deployment README typo

[bill-95]

Hello, it appears the "Testnet Deployment" section in README.md is missing the deployment settings in the .env.example box.

# Deployment settings
# Main 12000000 | Local 10000000 | Rinkeby 10000000 | Goerli 8000000
GAS_LIMIT=100000
# Mainnet will be over riden. 
GAS_PRICE=2500000000