Weekly github digest (Distributed Tracing WG specs)

Pull requests
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* w3c/trace-context (+0/-2/💬0)
  2 pull requests merged:
  - Update 20-http_header_format.md tracestate Value Section
    https://github.com/w3c/trace-context/pull/374 
  - move header format rationale to root
    https://github.com/w3c/trace-context/pull/370 


Repositories tracked by this digest:
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* https://github.com/w3c/trace-context
* https://github.com/w3c/correlation-context
* https://github.com/w3c/distributed-tracing-wg