Fix for not being able to register PSGallery repository behind web proxy (#410)

Author: muzzar78

src/PowerShellGet/private/functions/Resolve-Location.ps1

@@ -62,7 +62,7 @@ function Resolve-Location
 
         Write-Debug -Message "Ping-Endpoint: location=$Location, statuscode=$statusCode, resolvedLocation=$resolvedLocation"
 
-        if((($statusCode -eq 200) -or ($statusCode -eq 401)) -and $resolvedLocation)
+        if((($statusCode -eq 200) -or ($statusCode -eq 401) -or ($statusCode -eq 407)) -and $resolvedLocation)
         {
             return $resolvedLocation
         }