Bump snafu from 0.6.6 to 0.6.9

[dependabot-preview[bot]]

Bumps snafu from 0.6.6 to 0.6.9.

Changelog

Sourced from snafu's changelog.

0.6.9 - 2020-09-21

Added

• #[derive(Snafu)] is now supported on unit structs and structs with fields.
• ensure! now supports trailing commas.

Fixed

• The error text for a misuse of #[snafu(context)] was corrected.
• More usages of Option in the generated code are now fully qualified.

0.6.8 - 2020-05-11

Fixed

• The code generated by the Snafu macro no longer conflicts with a local module called core or snafu.

0.6.7 - 2020-05-03

Added

• Demonstration error types are now present in the guide.
• The user's guide is now an optional feature flag. To preserve compatibility, it is enabled by default, but most users can disable it.
• It is now possible to import the snafu crate under a different name using #[snafu(crate_root)].

Commits

• 091706f Release 0.6.9
• c6a5f29 Update the changelog
• 8d26b66 Merge pull request #250 from shepmaster/struct
• 534becd Include structs as possibilities in error messages
• c81c5a5 Add some compile-fail tests for struct errors
• d87a96f Add basic documentation for struct errors
• c0772fd Perform basic tests of generated code in Rust 1.31
• c1839b0 Support crate_root on struct errors
• d1a5b89 Reuse ErrorCompat generation for variants and structs
• 1bc8e2d Reuse Error generation for variants and structs
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

Looks like snafu is up-to-date now, so this is no longer needed.