Replaced Write-Warning with Write-Error so it can be caught in a try catch block.

Author: dotps1

Functions/Test-WannaCryVulnerability.ps1

@@ -12,6 +12,7 @@
     https://github.com/dotps1/PSFunctions
 .ReleaseNotes
     Replaced Write-Warning with Write-Error so it can be caught in a try catch block.
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