ModifyModuleVersion.ps1

$Manifest = Invoke-Expression -Command (Get-Content $OutManifest -Raw)
$LastChange = (Get-ChildItem $OutManifest).CreationTime
$ChangedFiles = ($Files | Where LastWriteTime -gt $LastChange).Count
$PercentChange = 100 - ((($Files.Count - $ChangedFiles) / $Files.Count) * 100)
$Version = ([version]$Manifest["ModuleVersion"]) | Select Major,Minor,Build,Revision
If ($PercentChange -ge 50)
{
    $Version.Major ++
    $Version.Minor = 0
    $Version.Build = 0
    $Version.Revision = 0
}
ElseIf ($PercentChange -ge 25)
{
    $Version.Minor ++
    $Version.Build = 0
    $Version.Revision = 0
}
ElseIf ($PercentChagne -ge 10)
{
    $Version.Build ++
    $Version.Revision = 0
}
ElseIf ($PercentChange -gt 0)
{
    $Version.Revision ++
}
$Manifest["ModuleVersion"] = "$($Version.Major).$($Version.Minor).$($Version.Build).$($Version.Revision)"