Add exception log failsafe for preloader crashs

BepInEx/Bootstrap/Preloader.cs

@@ -126,7 +126,7 @@ namespace BepInEx.Bootstrap
 				finally
 				{
 					File.WriteAllText(Path.Combine(Paths.GameRootPath, $"preloader_{DateTime.Now:yyyyMMdd_HHmmss_fff}.log"),
-						PreloaderLog.ToString());
+						PreloaderLog + "\r\n" + ex);
 
 					PreloaderLog.Dispose();
 				}