Crowdsales

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All crowdsale-related contracts were removed from the OpenZeppelin Contracts library on the v3.0.0 release due to both a decline in their usage and the complexity associated with migrating them to Solidity v0.6.

They are however still available on the v2.5 release of OpenZeppelin Contracts, which you can install by running:

$ npm install @openzeppelin/[email protected]

Refer to the v2.x documentation when working with them.

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