read_size_hint does not exceed read_message_max

[ashtum]

Fixes #2879

[vinniefalco]

Good commit message :)

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.

Project coverage is 93.20%. Comparing base (4bff457) to head (412c5d8).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2881   +/-   ##
========================================
  Coverage    93.20%   93.20%           
========================================
  Files          177      177           
  Lines        13671    13673    +2     
========================================
+ Hits         12742    12744    +2     
  Misses         929      929           

Files	Coverage Δ
include/boost/beast/websocket/detail/impl_base.hpp	86.01% <100.00%> (+0.29%)	⬆️
include/boost/beast/websocket/impl/read.hpp	95.24% <100.00%> (ø)
include/boost/beast/websocket/impl/stream_impl.hpp	96.19% <100.00%> (ø)
include/boost/beast/websocket/impl/stream.hpp	73.52% <0.00%> (-0.51%)	⬇️

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