CI is failing on PRs in `cargo fmt --all -- --check`, [for example](https://travis-ci.com/rust-lang/regex/jobs/257680677). Affected files include: * tests/bytes.rs * tests/consistent.rs * tests/crazy.rs * tests/unicode.rs Files generated by ucd-generate: * regex-syntax/src/unicode_tables/property_bool.rs * regex-syntax/src/unicode_tables/script.rs * regex-syntax/src/unicode_tables/script_extension.rs Generated scripts/regex-match-tests.py: * tests/fowler.rs