Fixed flake8 errors

Author: Raghavendra Sugeeth P S

onmt/trainer.py

@@ -308,13 +308,15 @@ def train(self,
             if (self.model_saver is not None
                 and (save_checkpoint_steps != 0
                      and step % save_checkpoint_steps == 0)):
-                self.model_saver.save(step, is_best, moving_average=self.moving_average)
+                self.model_saver.save(step, is_best,
+                                      moving_average=self.moving_average)
 
             if train_steps > 0 and step >= train_steps:
                 break
 
         if self.model_saver is not None:
-            self.model_saver.save(step, is_best, moving_average=self.moving_average)
+            self.model_saver.save(step, is_best,
+                                  moving_average=self.moving_average)
         return total_stats
 
     def validate(self, valid_iter, moving_average=None):