Fix deprecation

[jenschude]

• Changeset added

Closes #299

Features

Fixes

Breaking changes

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 12.84%. Comparing base (9dbf5ac) to head (8d31291).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
...ommercetools-base/src/Client/ClientCredentials.php	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #301   +/-   ##
=========================================
  Coverage     12.84%   12.84%           
  Complexity   116758   116758           
=========================================
  Files          9440     9440           
  Lines        289731   289731           
=========================================
  Hits          37220    37220           
  Misses       252511   252511           

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