Bump regex from 1.3.7 to 1.3.9

[dependabot-preview[bot]]

Bumps regex from 1.3.7 to 1.3.9.

Changelog

Sourced from regex's changelog.

1.3.9 (2020-05-28)

This release fixes a MSRV (Minimum Support Rust Version) regression in the 1.3.8 release. Namely, while 1.3.8 compiles on Rust 1.28, it actually does not compile on other Rust versions, such as Rust 1.39.

Bug fixes:

• [BUG #685](rust-lang/regex#685): Remove use of doc_comment crate, which cannot be used before Rust 1.43.

1.3.8 (2020-05-28)

This release contains a couple of important bug fixes driven by better support for empty-subexpressions in regexes. For example, regexes like b| are now allowed. Major thanks to @sliquister for implementing support for this in #677.

Bug fixes:

• [BUG #523](rust-lang/regex#523): Add note to documentation that spaces can be escaped in x mode.
• [BUG #524](rust-lang/regex#524): Add support for empty sub-expressions, including empty alternations.
• [BUG #659](rust-lang/regex#659): Fix match bug caused by an empty sub-expression miscompilation.

Commits

• 6916067 1.3.9
• d7fbd15 tests: remove use of doc_comment crate
• e005346 1.3.8
• 60e949b deps: bump regex-syntax minimum version to 0.6.18
• 9504716 regex-syntax-0.6.18
• 0e39314 changelog: 1.3.8
• 5180a97 compile: support empty patterns better
• ed581f5 tests: add tests involving the Empty regex
• d50d31b hir: make is_alternation_literal say false on Empty
• 0785926 tests: confirm that some counted repetitions are rejected
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

Superseded by #225.