tracing-core 0.1.21

0.1.21 (October 1, 2021)

This release adds support for recording Option<T> where T: Value as
typed tracing field values.

Added

• field: Value impl for Option<T> where T: Value (#1585)

Fixed

• Fixed deprecation warnings when building with default-features
  disabled (#1603, #1606)
• Documentation fixes and improvements (#1595, #1601)

Thanks to @BrianBurgers, @DCjanus, and @matklad for contributing to this
release!