reduce chunk header size based on buffer capacity

[ashtum]

resolves #141

[cppalliance-bot]

An automated preview of the documentation is available at https://150.http-proto.prtest.cppalliance.org/index.html

[cppalliance-bot]

An automated preview of the documentation is available at https://150.http-proto.prtest.cppalliance.org/index.html

[codecov]

Codecov Report

❌ Patch coverage is 98.31933% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.93%. Comparing base (f742d7c) to head (04d6788).
⚠️ Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/serializer.cpp	98.31%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #150      +/-   ##
===========================================
+ Coverage    91.82%   91.93%   +0.10%     
===========================================
  Files           76       76              
  Lines         5005     4974      -31     
===========================================
- Hits          4596     4573      -23     
+ Misses         409      401       -8     

Files with missing lines	Coverage Δ
include/boost/http_proto/serializer.hpp	100.00% <ø> (ø)
src/serializer.cpp	92.47% <98.31%> (+1.14%)	⬆️

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[cppalliance-bot]

An automated preview of the documentation is available at https://150.http-proto.prtest.cppalliance.org/index.html

[cppalliance-bot]

An automated preview of the documentation is available at https://150.http-proto.prtest.cppalliance.org/index.html

[cppalliance-bot]

An automated preview of the documentation is available at https://150.http-proto.prtest.cppalliance.org/index.html