OpenZeppelin / openzeppelin-solidity / 664

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Disallow ERC20._transfer from the zero address. (#1752)

* Add requirement of non-zero from to ERC20 transfer.

* Add test for transferFrom zero address to behavior.

* Create ERC20.transfer behavior.

* Add tests for _transfer.

* Add changelog entry.

* Fix linter error.

* Delete repeated test.

* Fix hardcoded error prefix.

* Update CHANGELOG.md

Co-Authored-By: Francisco Giordano <frangio.1@gmail.com>

* Address review comments.

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