Add a changelog entry

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Francisco Giordano
2021-03-03 16:49:15 -03:00
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commit 4e60480fdc

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# Changelog
## Unreleased
* `ERC721`: made `_approve` an internal function (was private).
## 3.4.0 (2021-02-02)
* `BeaconProxy`: added new kind of proxy that allows simultaneous atomic upgrades. ([#2411](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2411))