Added Slack to whitelist

This should resolve issue #83

Windows10Debloater.ps1

@@ -38,7 +38,7 @@ Function DebloatAll {
     #Credit to /u/GavinEke for a modified version of my whitelist code
     [regex]$WhitelistedApps = 'Microsoft.ScreenSketch|Microsoft.Paint3D|Microsoft.WindowsCalculator|Microsoft.WindowsStore|Microsoft.Windows.Photos|CanonicalGroupLimited.UbuntuonWindows|`
     Microsoft.XboxGameCallableUI|Microsoft.XboxGamingOverlay|Microsoft.Xbox.TCUI|Microsoft.XboxGamingOverlay|Microsoft.XboxIdentityProvider|Microsoft.MicrosoftStickyNotes|Microsoft.MSPaint|Microsoft.WindowsCamera|.NET|`
-    Microsoft.HEIFImageExtension|Microsoft.ScreenSketch|Microsoft.StorePurchaseApp|Microsoft.VP9VideoExtensions|Microsoft.WebMediaExtensions|Microsoft.WebpImageExtension|Microsoft.DesktopAppInstaller|WindSynthBerry|MIDIBerry'
+    Microsoft.HEIFImageExtension|Microsoft.ScreenSketch|Microsoft.StorePurchaseApp|Microsoft.VP9VideoExtensions|Microsoft.WebMediaExtensions|Microsoft.WebpImageExtension|Microsoft.DesktopAppInstaller|WindSynthBerry|MIDIBerry|Slack'
     Get-AppxPackage -AllUsers | Where-Object {$_.Name -NotMatch $WhitelistedApps} | Remove-AppxPackage
     Get-AppxPackage | Where-Object {$_.Name -NotMatch $WhitelistedApps} | Remove-AppxPackage
     Get-AppxProvisionedPackage -Online | Where-Object {$_.PackageName -NotMatch $WhitelistedApps} | Remove-AppxProvisionedPackage -Online