Bump proc-macro2 from 1.0.19 to 1.0.27

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Bumps proc-macro2 from 1.0.19 to 1.0.27.

Release notes

Sourced from proc-macro2's releases.

1.0.27

• impl FromStr for Literal (#286, rust-lang/rust#84717)

1.0.26

• Add impl LexError { pub fn span(&self) -> Span } (#283)

1.0.25

• Documentation improvements (#278, #279)

1.0.24

• Implement Error and Display for proc_macro2::LexError, matching the libproc_macro impls which exists in Rust 1.44+ (#240)

1.0.23

• Fix several bugs involving lexing of unicode escapes and carriage returns in string literals (#256, #257, #258, #259, #260)

1.0.22

• Fix several bugs involving lexing of integer and float tokens with unusual suffixes (#252, #253, #254, #255)

1.0.21

• Match libproc_macro's UnwindSafe and RefUnwindSafe impls (#250)

1.0.20

• Match libproc_macro's rendering of whitespace in groups (#246, #247, thanks @​Koxiaet)

Commits

• 2517d62 Release 1.0.27
• 6fcc4a2 Merge pull request #286 from dtolnay/literalfromstr
• 24f0bb5 Add Literal parse test
• 6d8b82d impl FromStr for Literal
• 56043a1 Release 1.0.26
• 301f8ab Merge pull request #283 from dtolnay/lexspan
• b120971 Unimportant lex errors in wrapper codepath
• 5abe9c1 Add span to unclosed delimiter lex error
• b8831c7 Add span to mismatched delimiter lex error
• 0e6a92f Add span to empty delimiter stack lex error
• Additional commits viewable in compare view

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