OpenZeppelin 2.1: first release candidate

General Announcements
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In this minor release we’re bringing back some features that were removed for the 2.0 release, adding new contracts requested by the community, and making some popular operations more gas efficient. :running_man: :dash:

To install the release candidate run npm install openzeppelin-solidity@next. We want to hear what you think!

The actual 2.1 release will come out after a week of no changes to the release candidate.

Highlights

  • Added WhitelistCrowdsale, a crowdsale where only whitelisted accounts (WhitelistedRole) can purchase tokens. Adding or removing accounts from the whitelist is done by whitelisters (WhitelisterRole). Similar to the pre-2.0 WhitelistedCrowdsale. (#1525)
  • ERC20's transferFrom and _burnFrom now emit Approval events, to represent the token’s state comprehensively through events. (#1524)
  • SafeMath now also supports signed integers (int256). (#1559)
  • ERC20 and ERC721 are now more gas efficient due to removed redundant SSTOREs and requires. (#1409 and #1549)

:new: See the details in our brand new CHANGELOG!

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