Merge pull request #68 from codecov/matt/checkpoint-logger-warning

fix: ezpz: downgrade checkpoint logger errors to warnings

helpers/checkpoint_logger.py

@@ -51,7 +51,7 @@ def _error(self, msg):
         if self.strict:
             raise ValueError(msg)
         else:
-            logger.error(msg)
+            logger.warning(msg)
 
     def _validate_checkpoint(self, checkpoint):
         if checkpoint.__class__ != self.cls: