v7.1.0

Features

• derive: enable more boxed types to be #[diagnostic_source] (#338) (c2f06f6c)
• source: derive common traits for NamedSource, SourceSpan, and SourceOffset (#340) (6f09250c)
• collection: add support for collection of labels (#341) (03060245)

Bug Fixes

• tests: revert test-breaking changes of e5c7ae4 (#339) (6e829f8c)