Add structopt dependency in version 0.3.7

This patch series replaces argparse with structopt in the argument
handling code. As a first step, we need structopt as a dependency.

Import subrepo structopt/:structopt at efbdda4753592e27bc430fb01f7b9650b2f3174d
Import subrepo bitflags/:bitflags at 30668016aca6bd3b02c766e8347e0b4080d4c296
Import subrepo clap/:clap at 784524f7eb193e35f81082cc69454c8c21b948f7
Import subrepo heck/:heck at 093d56fbf001e1506e56dbfa38631d99b1066df1
Import subrepo proc-macro-error/:proc-macro-error at 6c4cfe79a622c5de8ae68557993542be46eacae2
Import subrepo proc-macro2/:proc-macro2 at d5d48eddca4566e5438e8a2cbed4a74e049544de
Import subrepo quote/:quote at 727436c6c137b20f0f34dde5d8fda2679b9747ad
Import subrepo rustversion/:rustversion at 0c5663313516263059ce9059ef81fc7a1cf655ca
Import subrepo syn-mid/:syn-mid at 5d3d85414a9e6674e1857ec22a87b96e04a6851a
Import subrepo syn/:syn at e87c27e87f6f4ef8919d0372bdb056d53ef0d8f3
Import subrepo textwrap/:textwrap at abcd618beae3f74841032aa5b53c1086b0a57ca2
Import subrepo unicode-segmentation/:unicode-segmentation at 637c9874c4fe0c205ff27787faf150a40295c6c3
Import subrepo unicode-width/:unicode-width at 3033826f8bf05e82724140a981d5941e48fce393
Import subrepo unicode-xid/:unicode-xid at 4baae9fffb156ba229665b972a9cd5991787ceb7

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diff --git a/syn-mid/README.md b/syn-mid/README.md
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+# syn-mid
+
+[![Build Status][azure-badge]][azure-url]
+[![Crates.io][crates-version-badge]][crates-url]
+[![Docs.rs][docs-badge]][docs-url]
+[![License][crates-license-badge]][crates-url]
+[![Minimum supported Rust version][rustc-badge]][rustc-url]
+
+[azure-badge]: https://dev.azure.com/taiki-e/taiki-e/_apis/build/status/taiki-e.syn-mid?branchName=master
+[azure-url]: https://dev.azure.com/taiki-e/taiki-e/_build/latest?definitionId=11&branchName=master
+[crates-version-badge]: https://img.shields.io/crates/v/syn-mid.svg
+[crates-license-badge]: https://img.shields.io/crates/l/syn-mid.svg
+[crates-badge]: https://img.shields.io/crates/v/syn-mid.svg
+[crates-url]: https://crates.io/crates/syn-mid/
+[docs-badge]: https://docs.rs/syn-mid/badge.svg
+[docs-url]: https://docs.rs/syn-mid/
+[rustc-badge]: https://img.shields.io/badge/rustc-1.31+-lightgray.svg
+[rustc-url]: https://blog.rust-lang.org/2018/12/06/Rust-1.31-and-rust-2018.html
+
+Providing the features between "full" and "derive" of syn.
+
+This crate provides the following two unique data structures.
+
+* `syn_mid::ItemFn` -- A function whose body is not parsed.
+
+  ```text
+  fn process(n: usize) -> Result<()> { ... }
+  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^     ^
+  ```
+
+* `syn_mid::Block` -- A block whose body is not parsed.
+
+  ```text
+  { ... }
+  ^     ^
+  ```
+
+Other data structures are the same as data structures of [syn]. These are defined in this crate because they cannot be used in [syn] without "full" feature.
+
+[syn]: https://github.com/dtolnay/syn
+
+## Usage
+
+Add this to your `Cargo.toml`:
+
+```toml
+[dependencies]
+syn-mid = "0.4"
+```
+
+The current syn-mid requires Rust 1.31 or later.
+
+[**Examples**](examples)
+
+[**Documentation**](https://docs.rs/syn-mid/)
+
+## Optional features
+
+* **`clone-impls`** — Clone impls for all syntax tree types.
+
+## License
+
+Licensed under either of
+
+* Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or <http://www.apache.org/licenses/LICENSE-2.0>)
+* MIT license ([LICENSE-MIT](LICENSE-MIT) or <http://opensource.org/licenses/MIT>)
+
+at your option.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.