Bump proc-macro2 from 1.0.78 to 1.0.84

[dependabot[bot]]

Bumps proc-macro2 from 1.0.78 to 1.0.84.

Release notes

Sourced from proc-macro2's releases.

1.0.84

• Documentation improvements (#455, thanks @​CensoredUsername)

1.0.83

• Optimize the representation of Ident (#462)

1.0.82

• Resolve unexpected_cfgs warning (#456)

1.0.81

• Documentation improvements

1.0.80

• Add Literal::byte_character constructor (#449)
• Add Literal::c_string constructor #450)

1.0.79

• Clean up dead code

Commits

• 33c9578 Release 1.0.84
• d850da5 Merge pull request #455 from CensoredUsername/master
• eabac15 Add a warning to Delimiter::None that rustc currently does not respect it.
• 1b77aca Release 1.0.83
• 728eddf Merge pull request #462 from dtolnay/identsize
• c56c5e6 Drop irrelevant capacity field from Ident representation
• 464c2eb Merge pull request #461 from dtolnay/sizetest
• 6f894e7 Disable span size tests when layout is randomized
• 7b357af Add additional size tests
• abc7dff Merge pull request #460 from dtolnay/docsrs
• Additional commits viewable in compare view

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[dependabot[bot]]

Superseded by #54.