* Add Erc721 example with ink2.0 syntax

* Remove all println lines

* Remove use dynamic storage

update operator_approvals to <(AccountId, AccountId), bool>

* Remove all none_account related code

* Update author to Parity

* Add ink_prelude declared

* Update owned_tokens_count to AccountId -> u32

* Update tokenId from Hash to TokenId(u32)

* rebase example

* Initial migration to latest ink

* Fix approval

* Move approval

* Remove config file

* Add some tests

* Add more tests

* Patch approve

* Some fixes

* Add docs

* Update examples/erc721/Cargo.toml

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* Update examples/erc721/src/lib.rs

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* Update examples/erc721/src/lib.rs

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* Update examples/erc721/src/lib.rs

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* Update examples/erc721/src/lib.rs

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* Update examples/erc721/src/lib.rs

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* Update examples/erc721/src/lib.rs

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* Update examples/erc721/src/lib.rs

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* Update docs

* Update examples/erc721/src/lib.rs

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* Update examples/erc721/src/lib.rs

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* Update examples/erc721/src/lib.rs

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* Update examples/erc721/src/lib.rs

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* Update examples/erc721/src/lib.rs

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* Update examples/erc721/src/lib.rs

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* Update examples/erc721/src/lib.rs

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* Update examples/erc721/src/lib.rs

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* Update examples/erc721/src/lib.rs

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* Update examples/erc721/src/lib.rs

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* Update examples/erc721/src/lib.rs

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* Update examples/erc721/src/lib.rs

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* Update examples/erc721/src/lib.rs

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* Update examples/erc721/src/lib.rs

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* Update examples/erc721/src/lib.rs

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* Update examples/erc721/src/lib.rs

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* Update examples/erc721/src/lib.rs

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* Update examples/erc721/src/lib.rs

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* Update examples/erc721/src/lib.rs

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* Update examples/erc721/src/lib.rs

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* Update examples/erc721/src/lib.rs

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* Update examples/erc721/src/lib.rs

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* Update examples/erc721/src/lib.rs

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* Fix ids

* Update docs

* Update examples/erc721/src/lib.rs

* Update examples/erc721/src/lib.rs

* fix fmt

* fix fmt 2

* fix fmt 3

Co-authored-by: XatMassacrE <xxat.massacre@gmail.com>
Co-authored-by: Hero Bird <robin.freyler@gmail.com>