add QPACK (RFC 9204) to the list of supported RFCs

[marten-seemann]

No description provided.

[codecov]

Codecov Report

Merging #3485 (f527a04) into master (d5efd34) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3485   +/-   ##
=======================================
  Coverage   85.70%   85.70%           
=======================================
  Files         138      138           
  Lines       10049    10049           
=======================================
  Hits         8612     8612           
  Misses       1060     1060           
  Partials      377      377           

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