Migration opt in refactors and improvements

OpenZeppelin / openzeppelin-labs

A space for the community to interact and exchange ideas on the OpenZeppelin platform. Do not use in production!

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Closed maraoz closed 6 years ago

maraoz commented 6 years ago

Migrates to new upgradeability approach in https://github.com/zeppelinos/upgradeability-lib/
renames to migrating_legacy_token_opt_in
use OpenZeppelin in upgradeable token versions