Add a simple wrapper for address. (#1773)
* Updated code style to no more than120 characters per line. * Unify code comments style with Doxygen-style tags. * Fix the conflicts. * Add a return value in the contract ERC20Burnable. * A Add a wrapper function to change type of address to address payable. * U Modify Address utils. * A Add test case for Address. * U Modify code style in ERC20Burnable. * Add changelog entry. * Improved dev docs.
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# Changelog
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## 2.4.0 (unreleased)
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### New features:
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* `Address.toPayable`: added a helper to convert between address types without having to resort to low-level casting. ([#1773](https://github.com/OpenZeppelin/openzeppelin-solidity/pull/1773))
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## 2.3.0 (2019-05-27)
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### New features:
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