Cm accounts bug fix

[jeffotterpohl]

Pull Request (PR) description

When running Invoke-DscResource -Module ConfigMgrCBDsc -Name CMAccounts -Method Get -Properties @{SiteCode = 'TST';Account = 'TestUser} and only 1 account exists in CMAccounts you receive a CIMInstance error as originally it was expected and Array return vs a string. Updated module to fix this issue.

This Pull Request (PR) fixes the following issues

• Fixes #92

Task list

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

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This change is 

[codecov[bot]]

Codecov Report

Merging #93 (f48b489) into master (b81fa04) will increase coverage by 0%. The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #93   +/-   ##
=====================================
  Coverage      98%    98%           
=====================================
  Files          38     38           
  Lines        5246   5250    +4     
=====================================
+ Hits         5155   5159    +4     
  Misses         91     91