0.32.1

Added

• allow OpenTelemetry context access with SpanRef (#234)
• add event-counting filtering layer for spans (#228)
• publicly export SetParentError

Fixed

• fix panic in multithreaded follows-from

Other

• Remove unwanted dependency on opentelemetry sdk crate (#241)
• update README.md links to use the latest version (#239)
• remove thiserror and unused dependencies (#238)