Bump gimli from 0.15.0 to 0.21.0

[dependabot-preview]

Bumps gimli from 0.15.0 to 0.21.0.

Changelog

Sourced from gimli's changelog.

0.21.0

Released 2020/05/12.

Breaking changes

• Minimum Rust version increased to 1.38.0.

• Replaced read::Operation::Literal with Operation::UnsignedConstant and Operation::SignedConstant. Changed read::Operation::Bra and read::Operation::Skip to contain the target offset instead of the bytecode. #479

• Changed write::Expression to support references. Existing users can convert to use Expression::raw. #479

• Replaced write::AttributeValue::AnyUnitEntryRef with DebugInfoRef. Renamed write::AttributeValue::ThisUnitEntryRef to UnitRef. #479

• Added more optional features: endian-reader and fallible-iterator. #495 #498

Added

• Added read::Expression::operations #479

Fixed

• Fixed newlines in dwarfdump example. #470

• Ignore zero terminators when reading .debug_frame sections. #486

• Increase the number of CFI register rules supported by read::UnwindContext. #487

• Fixed version handling and return register encoding when reading .eh_frame sections. #493

Changed

• Added EhFrame and DebugFrame to write::Sections. #492

• Improved performance of write::LineProgram::generate_row. #476

... (truncated)

Commits

• 73c43d4 Merge pull request #499 from philipc/release
• 862f3ce Bump version to 0.21.0
• d8a6963 Update changelog
• 1bdd59d Update object to 0.19
• 2467adb Merge pull request #498 from alexcrichton/one-more-crate
• 7a0c08f Remove dependency of read on stable_deref_trait
• be9ea4e Merge pull request #496 from alexcrichton/remove-smallvec
• 91a4446 Remove smallvec dependency
• c4d93b1 Merge pull request #497 from alexcrichton/rm-arrayvec
• d31004f Remove the arrayvec dependency
• Additional commits viewable in compare view

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Superseded by #129.