Bump syn from 0.15.36 to 1.0.4

[dependabot-preview[bot]]

Bumps syn from 0.15.36 to 1.0.4.

Release notes

*Sourced from [syn's releases](https://github.com/dtolnay/syn/releases).* > ## 1.0.4 > - Fix size_hint of Punctuated iterators ([#700](https://github-redirect.dependabot.com/dtolnay/syn/issues/700), thanks [@​ExpHP](https://github.com/ExpHP)) > > ## 1.0.3 > - Add [`Path::get_ident`](https://docs.rs/syn/1.0/syn/struct.Path.html#method.get_ident) ([#696](https://github-redirect.dependabot.com/dtolnay/syn/issues/696), thanks [@​infinity0](https://github.com/infinity0)) > > ## 1.0.2 > - Documentation improvements > > ## 1.0.1 > - Add [`LitInt::base10_parse`](https://docs.rs/syn/1.0/syn/struct.LitInt.html#method.base10_parse) to produce error that has the right span when parsing literal digits > > ## 1.0.0 > Syn is a library for parsing Rust code, largely geared toward use in procedural macros but generally applicable as a Rust parser outside of that too. > > Syn was originally a sidequest on the effort to making [Serde]'s derive macros work on stable Rust in 2016, but has since taken off as a foundational library in its own right. These days it appears in support of diverse use cases like: > > - [convenient interop between Rust-based Wasm modules and JavaScript][wasm-bindgen], > - [easy command line interfaces][structopt], > - [a polished async experience][runtime], and > - [a concurrency framework for embedded real time systems][rtfm]. > > [Serde]: https://serde.rs/ > [wasm-bindgen]: https://github.com/rustwasm/wasm-bindgen > [structopt]: https://docs.rs/structopt/0.2.18/structopt/ > [runtime]: https://github.com/rustasync/runtime > [rtfm]: https://japaric.github.io/rtfm5/book/en/by-example/tasks.html > > Excitingly, the fraction of open source Rust projects that rely on Syn is still climbing aggressively (see red line). This reflects how important procedural macros are to the experience we want people to have when working with Rust — empowering everyone to build reliable and efficient software. > >
> >  > >
> > This 1.0 release signifies that Syn is a polished library with a stable design and role and that it offers a user experience we can stand behind as the way we recommend for all Rustaceans to write procedural macros. > > Be aware that the underlying Rust language will continue to evolve. Syn is able to accommodate most kinds of Rust grammar changes via the nonexhaustive enums and `Verbatim` variants in the syntax tree, but we will plan to put out new major versions on a 12 to 24 month cadence to incorporate ongoing language changes as needed. > >
> > *Note: in combination with this release, please see also the [release notes for quote 1.0][quote] which resolves multiple longstanding limitations of the quote macro.* > > [quote]: https://github.com/dtolnay/quote/releases/tag/1.0.0 > >
> > # Breaking changes > > ... (truncated)

Commits

- [`89c77ed`](https://github.com/dtolnay/syn/commit/89c77ed934b53d78fc26644a0a21f32659185bf7) Release 1.0.4 - [`e51cb9b`](https://github.com/dtolnay/syn/commit/e51cb9bac4492eed6ca6590c4ca500e4450c4e36) Format with rustfmt 2019-08-19 - [`29bafc1`](https://github.com/dtolnay/syn/commit/29bafc15f417f349b8f971dec977aea23815c168) Merge pull request [#700](https://github-redirect.dependabot.com/dtolnay/syn/issues/700) from exphp-forks/fix-iterators - [`477ac22`](https://github.com/dtolnay/syn/commit/477ac22079b8376e0c070ee2e94c2c2d9d7ed630) Add missing size_hint implementations - [`59da4f1`](https://github.com/dtolnay/syn/commit/59da4f106525452ad83300e740d56074aaff3a60) Update test suite to nightly-2019-08-19 - [`801a0eb`](https://github.com/dtolnay/syn/commit/801a0eb4299d6fc03029470df2f0aa538bbbb449) Release 1.0.3 - [`68dc509`](https://github.com/dtolnay/syn/commit/68dc5092e967d56c62a8986c79bf637fcb0ca049) Update test suite to nightly-2019-08-18 - [`47ac654`](https://github.com/dtolnay/syn/commit/47ac654ae0be4faa2f430f74c895f8bbf2728a1a) Add an accessor to get Receiver's lifetime - [`3be160b`](https://github.com/dtolnay/syn/commit/3be160bb6a44448b1fcb2ec5b199ed21e1eaefb2) Add an example for Path::is_ident - [`68fcbb0`](https://github.com/dtolnay/syn/commit/68fcbb07b8567483d1c7a2892ff670fb3d388408) Adjust is_ident and get_ident docs - Additional commits viewable in [compare view](https://github.com/dtolnay/syn/compare/0.15.36...1.0.4)

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[dependabot-preview[bot]]

Superseded by #113.