Avoid copying lock warning

[cppcoffee]

use tls.Config.Clone() to avoid copying lock warning

Fixed #235

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.96%. Comparing base (5b4f5bc) to head (0d6194b).

Files with missing lines	Patch %	Lines
client.go	0.00%	2 Missing ⚠️

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (70.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #240   +/-   ##
=======================================
  Coverage   64.96%   64.96%           
=======================================
  Files          27       27           
  Lines        2637     2637           
=======================================
  Hits         1713     1713           
  Misses        913      913           
  Partials       11       11           

Flag	Coverage Δ
go	64.96% <0.00%> (ø)
wasm	41.48% <0.00%> (ø)

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[JoeTurki]

Hello, sadly this doesn't fix #235 we still hold TLSConfig by value.

[cppcoffee]

I got it.