update qpack to v0.2.0

[marten-seemann]

qpack v0.2.0:

• adds support for encoding using the static table
• uses Huffman-encoding to encode string literals

[codecov]

Codecov Report

Merging #2704 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2704   +/-   ##
=======================================
  Coverage   86.77%   86.77%           
=======================================
  Files         124      124           
  Lines        9893     9893           
=======================================
  Hits         8584     8584           
  Misses        979      979           
  Partials      330      330           

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