Revert "Disable render-to-memory on Windows"

This reverts commit 91e0c2b1fe.

This should now work.

commands/server.go

@@ -137,11 +137,6 @@ func server(cmd *cobra.Command, args []string) {
 		renderToDisk = true
 	}
 
-	if !renderToDisk && runtime.GOOS == "windows" {
-		jww.ERROR.Println("Render to memory currently not supported in Windows, see https://github.com/spf13/hugo/issues/1586")
-		renderToDisk = true
-	}
-
 	// Hugo writes the output to memory instead of the disk
 	if !renderToDisk {
 		hugofs.DestinationFS = new(afero.MemMapFs)