Bump proc-macro2 from 0.4.30 to 1.0.20

[dependabot-preview]

Bumps proc-macro2 from 0.4.30 to 1.0.20.

Release notes

Sourced from proc-macro2's releases.

1.0.20

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

1.0.19

• Remove procmacro2_semver_exempt feature gate on all methods stabilized in Rust 1.45 (#243)

1.0.18

• Fix discrepancy with libproc_macro in handling of negative numbers in token streams (#235)

1.0.17

• Allow using proc_macro2::fallback::force() from 1.0.12 at the same time as proc-macro2 = { default-features = false } (#233)

1.0.16

• impl Ord for proc_macro2::LineColumn (#230, rust-lang/rust#72446)

1.0.15

• Support parsing arbitrarily deeply nested token streams without using excessive stack space (#231, #232)

1.0.14

• Add Span::mixed_site(), which is behind cfg(procmacro2_semver_exempt) for now but will be stabilized when Rust 1.45 is released (#228, thanks @kevinmehall)
• Update LineColumn::column to match libproc_macro's column computation, which is character-based (#229, thanks @jrvidal)

1.0.13

• Parse literal suffix on byte string, byte, and char literal tokens: br#"..."#suffix, b'?'suffix, '?'suffix

1.0.12

• Add a way to force avoid using the compiler's libproc_macro implementation even when available (#220)

1.0.11

(yanked)

1.0.10

• Enable span-locations feature when building for play.rust-lang.org

1.0.9

• Match the escaping behavior of libproc_macro when displaying non-ascii strings and characters

1.0.8

• Work around rust-lang/rust#58736 which caused panics in TokenStream::from_str

1.0.7

• Return meaningful spans from Group::span_open and Group::span_close when running with span-locations feature enabled outside of a procedural macro

1.0.6

• No code changes.

Just retriggering a docs.rs build because 1.0.5 failed. See alexcrichton/proc-macro2#203 and rust-lang/docs.rs#440.

1.0.5

• Improve performance of impl Extend<TokenTree> for TokenStream (#198)

Commits

• 49e8bd2 Release 1.0.20
• c7c120a Merge pull request #247 from alexcrichton/groupfmt
• c55d421 Add Group fmt test
• 4101b0c Match libproc_macro formatting of groups
• f920f38 Merge pull request #246 from Koxiaet/master
• bef084b Improve fallback Display impl for TokenStream
• 82757dc Clean up unused empty strnom file
• d4e3d97 Release 1.0.19
• 8ede321 Merge pull request #243 from CensoredUsername/stabilize_1_45
• 7be4c9a Remove procmacro2_semver_exempt feature gate on all methods stabilized in rus...
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #605.