Use PUT for /exchanges/:exchangeId in client

[diehuxx]

Thanks @jiyoontbd for flagging !

For the /exchanges/:exchangeId endpoint, we should be using PUT, not POST. Source

[codecov-commenter]

Codecov Report

Merging #214 (5f3b9b6) into main (14aff82) will not change coverage.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #214   +/-   ##
=======================================
  Coverage   77.90%   77.90%           
=======================================
  Files          35       35           
  Lines         869      869           
  Branches       89       89           
=======================================
  Hits          677      677           
  Misses        142      142           
  Partials       50       50           

Components	Coverage Δ
protocol	82.99% <ø> (ø)
httpclient	80.82% <100.00%> (ø)

[jiyoonie9]

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