Update codegen requirement from 0.1.3 to 0.2.0

[dependabot[bot]]

Updates the requirements on codegen to permit the latest version.

Changelog

Sourced from codegen's changelog.

Changed

• updated the crate to rust 2018 edition

0.1.3 (May 9, 2020)

Added

• Add support to define function attributes and extern functions
• Add support to define async functions
• Add support to add macros to traits and impls

0.1.2 (May 9, 2020)

Added

• Add ability to add functions directly to scope
• Add documentation comments and annotations to struct fields

0.1.1 (March 15, 2019)

Added

• Specifying lint attributes (#13)
• Specifying repr attribute on struct and enum (#12)

0.1.0 (November 10, 2018)

Initial release

Commits

• See full diff in compare view

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[ridiculousfish]

This breaks gen-unicode and I haven't the motivation to figure out why.

[dependabot[bot]]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.