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Add changelog entries for proxies and ERC20Snapshot

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Francisco Giordano
2020-09-03 14:13:11 -03:00
parent 91f16a7e47
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CHANGELOG.md
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# Changelog
## 3.1.1 (Unreleased)
## 3.2.0 (unreleased)
### New features
* Proxies: added the proxy contracts from OpenZeppelin SDK. ([#2335](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2335))
### Improvements
* `Address.isContract`: switched from `extcodehash` to `extcodesize` for less gas usage. ([#2311](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2311))
### Breaking changes
* `ERC20Snapshot`: switched to using `_beforeTokenTransfer` hook instead of overriding ERC20 operations. ([#2312](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2312))
This small change in the way we implemented `ERC20Snapshot` may affect users who are combining this contract with
other ERC20 flavors, since it no longer overrides `_transfer`, `_mint`, and `_burn`. This can result in having to remove Solidity `override(...)` specifiers in derived contracts for these functions, and to instead have to add it for `_beforeTokenTransfer`. See [Using Hooks](https://docs.openzeppelin.com/contracts/3.x/extending-contracts#using-hooks) in the documentation.
## 3.1.0 (2020-06-23)
### New features