Update pytorch_lightning/callbacks/lr_logger.py

Co-Authored-By: Adrian Wälchli <aedu.waelchli@gmail.com>

pytorch_lightning/callbacks/lr_logger.py

@@ -53,7 +53,7 @@ def on_train_start(self, trainer, pl_module):
 
         if not trainer.logger:
             raise MisconfigurationException(
-                'Cannot use LearningRateLogger callback with Trainer that have no logger.')
+                'Cannot use LearningRateLogger callback with Trainer that has no logger.')
 
         # Create uniqe names in the case we have multiple of the same learning
         # rate schduler + multiple parameter groups