Fix: Nonce too low error on 2nd contract deploy

[MattWong-ca]

Description

• When following README and doing yarn deploy we get a nonce too low error due to the sequential contract deployments. Adding a 30s wait time after the first one is deployed fixes this.
• I tried using hardhat's await for the 1st contract and adding the 1st contract as a dependency, but neither solutions worked so I resorted with the 30s wait (30 was an arbitrary number)

Additional Information

• I have read the contributing docs (if this is your first contribution)
• This is not a duplicate of any existing pull request

Related Issues

Closes #60

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