Fix socks5 reply reading

[rigens]

Some socks5 servers only send the first three bytes of the reply when an error occurs. Python-socks tries to read four bytes and hangs.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.13%. Comparing base (50a3024) to head (bc674a2).
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Additional details and impacted files

@@ Coverage Diff @@## master #46 +/- ##
=======================================
Coverage 96.13% 96.13% =======================================
Files 68 68 Lines 1733 1735 +2 =======================================
+ Hits 1666 1668 +2 
Misses 67 67 

Flag	Coverage Δ
unit	96.13% <100.00%> (+<0.01%)	⬆️

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