Update tracing-appender requirement from 0.1 to 0.2

[dependabot[bot]]

Updates the requirements on tracing-appender to permit the latest version.

Release notes

Sourced from tracing-appender's releases.

tracing-error v0.2.0

0.2.0 (October 23, 2021)

This is a breaking change release in order to update the tracing-subscriber dependency version to the v0.3.x release series.

Changed

• Updated tracing-subscriber dependency to v0.3.0 (#1677)

Fixed

• Disabled default features of the tracing dependency so that proc-macro dependencies are not enabled (#1144)
• Documentation fixes and improvements (#635, #695)

Added

• SpanTrace: Added SpanTrace::new constructor for constructing a SpanTrace from a Span passed as an argument (rather than capturing the current span) (#1492)

Thanks to @​CAD97 for contributing to this release!

Commits

• aaa419b appender: prepare to release v0.2.0 (#1678)
• 4e56741 subscriber: prepare to release v0.3.0 (#1677)
• f461c5b appender: fix compilation 32-bit platforms like PowerPC (#1675)
• 8777d2c subscriber: rename Layer::new_span to on_new_span (#1674)
• c62dac9 appender: replace chrono with time (#1652)
• 60a2644 chore: add CI env variable configurations (#1672)
• ffdce75 docs: add blog posts as external resources (#1667)
• d019e43 core: update parent() documentation (#1665)
• f5aac47 attributes: refactor into separate modules (#1643)
• 8540abc attributes: speculative expand when parsing fails (#1634)
• Additional commits viewable in compare view

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[dependabot[bot]]

Looks like tracing-appender is no longer a dependency, so this is no longer needed.