Refactor add method to add_batch in horizonmetrics.py

horizonmetrics.py

@@ -95,7 +95,7 @@ class horizonmetrics(evaluate.Metric):
             codebase_urls=["http://github.com/path/to/codebase/of/new_module"],
             reference_urls=["http://path.to.reference.url/new_module"])
 
-    def add(self, *, predictions, references, **kwargs):
+    def add_batch(self, *, predictions, references, **kwargs):
         """
         Update the predictions and ground truth detections.