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Add SafeERC20 bugfix changelog entry.

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Nicolás Venturo 6 years ago
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      CHANGELOG.md

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CHANGELOG.md
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@ -14,6 +14,7 @@
* Fixed variable shadowing issues. ([#1606](https://github.com/OpenZeppelin/openzeppelin-solidity/pull/1606))
### Bugfixes:
* (minor) `SafeERC20`: `safeApprove` wasn't properly checking for a zero allowance when attempting to set a non-zero allowance. ([#1647](https://github.com/OpenZeppelin/openzeppelin-solidity/pull/1647))
### Breaking changes:
* `TokenMetadata` (in drafts) has been renamed to `ERC20Metadata`. ([#1618](https://github.com/OpenZeppelin/openzeppelin-solidity/pull/1618))

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