webdriverio: Update changelog for cli array arguments

[WillBrock]

Proposed changes

--spec and --suite has changed from a string argument to an array in v5. This updates the changelog with those changes.

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Reviewers: @webdriverio/technical-committee

[codecov]

Codecov Report

Merging #3220 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3220   +/-   ##
=======================================
  Coverage   96.39%   96.39%           
=======================================
  Files         130      130           
  Lines        2773     2773           
  Branches      592      592           
=======================================
  Hits         2673     2673           
  Misses         90       90           
  Partials       10       10

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[christian-bromann]

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