Add BREAKING CHANGE to CHANGELOG.MD - Fixes #171

[PlagueHO]

Pull Request (PR) description

This PR adds the BREAKING CHANGE information to the CHANGELOG.MD that got missed when submitting PR #193.

This Pull Request (PR) fixes the following issues

Fixes #171

Task list

• Added an entry under the Unreleased section of the change log in the CHANGELOG.md.
  Entry should say what was changed, and how that affects users (if applicable).
• Resource documentation added/updated in README.md in the resource folder.
• Resource parameter descriptions added/updated in schema.mof
  and comment-based help.
• Comment-based help added/updated.
• Localization strings added/updated in all localization files as appropriate.
• Examples appropriately added/updated.
• Unit tests added/updated. See DSC Resource Testing Guidelines.
• Integration tests added/updated (where possible). See DSC Resource Testing Guidelines.
• New/changed code adheres to DSC Resource Style Guidelines and Best Practices.

@johlju - would you mind reviewing?

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This change is 

[johlju]

Reviewed 1 of 1 files at r1.
Reviewable status: complete! all files reviewed, all discussions resolved

[codecov-io]

Codecov Report

Merging #194 into dev will not change coverage.
The diff coverage is n/a.

@@        Coverage Diff         @@
##           dev   #194   +/-   ##
==================================
  Coverage   90%    90%           
==================================
  Files        7      7           
  Lines      735    735           
==================================
  Hits       667    667           
  Misses      68     68