Changelog

3.0.0 - 2019-08-08

Major breaking changes: removal of definitions for Order, OrderInfo, order_to_jsdict, jsdict_to_order, all of which have been moved to contract_wrappers.exchange.types; removal of signature validation; migration from v4 to v5 of Web3.py

Changed ERC20AssetData and ERC721AssetData to inherit from NamedTuple rather than TypedDict.
Deprecated methods encode_erc20_asset_data() and encode_erc721_asset_data(), in favor of new methods encode_erc20() and encode_erc721(). The old methods return a string, which is less than convenient for building orders using the provided Order type, which expects asset data to be bytes. The new methods return bytes.
Expanded documentation.
Stopped using deprecated web3.py interface contract.call() in favor of contract.functions.X.call(). This provides compatibility with the upcoming 5.x release of web3.py, and it also eliminates some runtime warning messages.

Replaced dependency on web3 with dependency on 0x-web3, to ease coexistence of those two packages.