Changelog

v3.0.0

Two new levels: Puppet v3 and ABI Smuggling
Heavy rework of Safe Miners challenge. Now called "Wallet mining".
Unstoppable challenge now uses a tokenized vault following ERC4626.
Some challenges now explicitly require to be solved in a single transaction.
Now using ERC3156 for some flashloan pools.
Now the Damn Valuable Token uses ERC2612. Therefore, added eth-permit as a dependency to ease signing permit data.
Welcome solady and solmate!
Migrate from Waffle to Hardhat Chai Matchers (following this guide)
Change final assertion in Puppet challenge following PR#9.
Remove unnecessary awaits in "The Rewarder" challenge following PR#12
Remove the WETH9 contract, and import it from solmate instead.
Change timestamp comparison in ClimberTimelock contract following PR#16 and additional refactors.
The player now plays with the player account.
Lots of quality of life changes in dependencies, custom errors, error messages, variable names, docs, gas optimizations (assembly, yay!) and code organization.

Refactor testing environment. Now using Hardhat, Ethers and Waffle. This should give players a better debugging experience, and allow them to familiarize with up-to-date JavaScript tooling for smart contract testing.
New levels:
- Backdoor
- Climber
- Free Rider
- Puppet v2
New integrations with Gnosis Safe wallets, Uniswap v2, WETH9 and the upgradebale version of OpenZeppelin Contracts.
Tweaks in existing challenges after community feedback
- Upgraded most contracts to Solidity 0.8
- Changes in internal libraries around low-level calls and transfers of ETH. Now mostly using OpenZeppelin Contracts utilities.
- In existing Puppet and The Rewarder challenges, better encapsulate issues to avoid repetitions.
- Reorganization of some files
Changed from npm to yarn as dependency manager

Initial version