derive-eip712: initial implementation of eip712 derive macro

.gitignore

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 /target
+.vscode

CHANGELOG.md

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 ### Unreleased
 
-* Use rust types as contract function inputs for human readable abi [#482](https://github.com/gakonst/ethers-rs/pull/482)
-* 
+- Use rust types as contract function inputs for human readable abi [#482](https://github.com/gakonst/ethers-rs/pull/482)
+- Add EIP-712 `sign_typed_data` signer method; add ethers-core type `Eip712` trait and derive macro in ethers-derive-eip712 [#481](https://github.com/gakonst/ethers-rs/pull/481)
+
 ### 0.5.3
 
-* Allow configuring the optimizer & passing arbitrary arguments to solc [#427](https://github.com/gakonst/ethers-rs/pull/427)
-* Decimal support for `ethers_core::utils::parse_units` [#463](https://github.com/gakonst/ethers-rs/pull/463)
-* Fixed Wei unit calculation in `Units` [#460](https://github.com/gakonst/ethers-rs/pull/460)
-* Add `ethers_core::utils::get_create2_address_from_hash` [#444](https://github.com/gakonst/ethers-rs/pull/444)
-* Bumped ethabi to 0.15.0 and fixing breaking changes [#469](https://github.com/gakonst/ethers-rs/pull/469), [#448](https://github.com/gakonst/ethers-rs/pull/448), [#445](https://github.com/gakonst/ethers-rs/pull/445)
+- Allow configuring the optimizer & passing arbitrary arguments to solc [#427](https://github.com/gakonst/ethers-rs/pull/427)
+- Decimal support for `ethers_core::utils::parse_units` [#463](https://github.com/gakonst/ethers-rs/pull/463)
+- Fixed Wei unit calculation in `Units` [#460](https://github.com/gakonst/ethers-rs/pull/460)
+- Add `ethers_core::utils::get_create2_address_from_hash` [#444](https://github.com/gakonst/ethers-rs/pull/444)
+- Bumped ethabi to 0.15.0 and fixing breaking changes [#469](https://github.com/gakonst/ethers-rs/pull/469), [#448](https://github.com/gakonst/ethers-rs/pull/448), [#445](https://github.com/gakonst/ethers-rs/pull/445)
 
 ### 0.5.2
-* Correctly RLP Encode transactions as received from the mempool ([#415](https://github.com/gakonst/ethers-rs/pull/415))
+
+- Correctly RLP Encode transactions as received from the mempool ([#415](https://github.com/gakonst/ethers-rs/pull/415))
 
 ## ethers-providers
 
 ### Unreleased
 
 ### 0.5.3
 
-* Expose `ens` module [#435](https://github.com/gakonst/ethers-rs/pull/435)
-* Add `eth_getProof` [#459](https://github.com/gakonst/ethers-rs/pull/459)
+- Expose `ens` module [#435](https://github.com/gakonst/ethers-rs/pull/435)
+- Add `eth_getProof` [#459](https://github.com/gakonst/ethers-rs/pull/459)
 
 ### 0.5.2
-* Set resolved ENS name during gas estimation ([1e5a9e](https://github.com/gakonst/ethers-rs/commit/1e5a9efb3c678eecd43d5c341b4932da35445831))
+
+- Set resolved ENS name during gas estimation ([1e5a9e](https://github.com/gakonst/ethers-rs/commit/1e5a9efb3c678eecd43d5c341b4932da35445831))
 
 ## ethers-signers
 
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 ### Unreleased
 
 ### 0.5.3
-* (De)Tokenize structs and events with only a single field as `Token:Tuple` ([#417](https://github.com/gakonst/ethers-rs/pull/417))
+
+- (De)Tokenize structs and events with only a single field as `Token:Tuple` ([#417](https://github.com/gakonst/ethers-rs/pull/417))
 
 ## ethers-middleware
 
 ### Unreleased
 
 ### 0.5.3
 
-* Added Time Lagged middleware [#457](https://github.com/gakonst/ethers-rs/pull/457)
+- Added Time Lagged middleware [#457](https://github.com/gakonst/ethers-rs/pull/457)