Merge pull request #449 from vinhloc30796/fix/minor-error-msg

Message: "start_timestamp must be less than end_timestamp"

ethereumetl/service/eth_service.py

@@ -40,7 +40,7 @@ def get_block_range_for_timestamps(self, start_timestamp, end_timestamp):
         start_timestamp = int(start_timestamp)
         end_timestamp = int(end_timestamp)
         if start_timestamp > end_timestamp:
-            raise ValueError('start_timestamp must be greater or equal to end_timestamp')
+            raise ValueError('start_timestamp must be lesser than end_timestamp')
 
         try:
             start_block_bounds = self._graph_operations.get_bounds_for_y_coordinate(start_timestamp)