Handle exceptions of invalid WS versions

[offa]

Handling of missing or invalid Sec-WebSocket-Version header added (#131).

[codecov[bot]]

Codecov Report

Merging #132 into master will decrease coverage by 0.08%. The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #132      +/-   ##
==========================================
- Coverage   37.82%   37.74%   -0.09%     
==========================================
  Files          52       52              
  Lines        2255     2260       +5     
==========================================
  Hits          853      853              
- Misses       1402     1407       +5

Impacted Files	Coverage Δ
src/main/c/Connection.cpp	21.4% <0%> (-0.12%)	:arrow_down:
src/main/c/seasocks/ResponseCodeDefs.h	3.12% <0%> (-0.11%)	:arrow_down:

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[mattgodbolt]

Thanks!