Bump syn from 1.0.11 to 1.0.20

[dependabot-preview[bot]]

Bumps syn from 1.0.11 to 1.0.20.

Release notes

Sourced from syn's releases.

1.0.20

• Improve span of error message when an error during syn::Macro::parse_body is triggered past the last token of the macro body (#791)

1.0.19

• Parse a more lenient extern type syntax inside extern blocks (#763)

1.0.18

• Ignore unparsed empty None-delimited groups at the end of a macro input (#783)

1.0.17

• Expose syn::Lit in default-features = false mode

1.0.16

• Fix parsing of &raw raw reference operator (rust-lang/rust#64490) to require explicitly specified constness, &raw mut or &raw const

1.0.15

• Add Punctuated::first_mut to return a mut reference to the first sequence element

1.0.14

• Produce more helpful error messages from Attribute::parse_args

1.0.13

• Allow parse_quote! to parse Vec<Stmt>, with the same behavior as Block::parse_within (#741)

1.0.12

• Reject function signatures with an incorrectly placed receiver parameter, like fn f(x: u8, &self)
• Produce correctly spanned error when parsing punct beyond the end of a delimited group (#739)

Commits

• 80c0238 Release 1.0.20
• 5e65424 Merge pull request #791 from dtolnay/close
• 1451738 Somewhat better scope span for Macro::parse_body
• 89a9ab1 Update test suite to nightly-2020-05-10
• e51bb8b Release 1.0.19
• 8e016b4 Merge pull request #790 from dtolnay/ety
• e98f372 Parse ForeignItem type with generics and bounds
• f104279 Remove travis bug workaround
• d290269 Update build status badge to GitHub Actions
• 562ce7b Remove Travis configuration
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

Superseded by #65.