OpenZeppelin Contracts 4.1: UUPS upgrade proxy, Multicall batch transactions, ERC20FlashMint extension, Cryptography tools ERC2098 & SignatureChecker; npm install @openzeppelin/contracts

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OpenZeppelin Contracts 4.1: UUPS upgrade proxy, Multicall batch transactions, ERC20FlashMint extension, Cryptography tools ERC2098 & SignatureChecker; npm install @openzeppelin/contracts

OpenZeppelin Contracts 4.1: UUPS upgrade proxy, Multicall batch transactions, ERC20FlashMint extension, Cryptography tools ERC2098 & SignatureChecker; npm install @openzeppelin/contracts submitted by /u/abcoathup
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