use printstacktrace instead of println

Author: ferreusveritas

src/main/java/com/ferreusveritas/dynamictrees/DynamicTrees.java

@@ -84,7 +84,7 @@ public void preInit(FMLPreInitializationEvent event) {
 			proxy.preInit();
 			compatProxy.preInit();
 		} catch (Exception e) {
-			System.out.println(e);
+			e.printStackTrace();
 		}
 
 	}