Fix typos
Fix code typo - reported by community member via Intercom
Format code
Add SPDX license identifiers
Update to Solidity 0.6 (where possible)
Update to OpenZeppelin Contracts 3.x/OpenZeppelin Contracts Ethereum Package
Update samples to use latest CLI output
Fix typos Fix code typo - reported by community member via Intercom Format code Add SPDX license identifiers Update to Solidity 0.6 (where possible) Update to OpenZeppelin Contracts 3.x/OpenZeppelin Contracts Ethereum Package Update samples to use latest CLI output