Allow either .yaml or .yml suffixes for alias files

extra_data/reader.py

@@ -645,7 +645,7 @@ def _load_aliases_from_file(self, aliases_path):
             with open(aliases_path, 'r') as f:
                 data = json.load(f)
 
-        elif aliases_path.suffix == '.yaml':
+        elif aliases_path.suffix in ['.yaml', '.yml']:
             import yaml
 
             with open(aliases_path, 'r') as f: