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
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Import subrepo proc-macro-error/:proc-macro-error at 6c4cfe79a622c5de8ae68557993542be46eacae2
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Import subrepo rustversion/:rustversion at 0c5663313516263059ce9059ef81fc7a1cf655ca
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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/unicode-xid/README.md b/unicode-xid/README.md
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+# unicode-xid
+
+Determine if a `char` is a valid identifier for a parser and/or lexer according to
+[Unicode Standard Annex #31](http://www.unicode.org/reports/tr31/) rules.
+
+[![Build Status](https://travis-ci.org/unicode-rs/unicode-xid.svg)](https://travis-ci.org/unicode-rs/unicode-xid)
+
+[Documentation](https://unicode-rs.github.io/unicode-xid/unicode_xid/index.html)
+
+```rust
+extern crate unicode_xid;
+
+use unicode_xid::UnicodeXID;
+
+fn main() {
+    let ch = 'a';
+    println!("Is {} a valid start of an identifier? {}", ch, UnicodeXID::is_xid_start(ch));
+}
+```
+
+# features
+
+unicode-xid supports a `no_std` feature. This eliminates dependence
+on std, and instead uses equivalent functions from core.
+
+# crates.io
+
+You can use this package in your project by adding the following
+to your `Cargo.toml`:
+
+```toml
+[dependencies]
+unicode-xid = "0.1.0"
+```
+
+# changelog
+
+## 0.2.0
+
+- Update to Unicode 12.1.0.
+
+## 0.1.0
+
+- Initial release.