Revert api change

Author: sergioteula

amazon_paapi/api.py

@@ -120,8 +120,8 @@ def search_items(
         actor: str = None,
         artist: str = None,
         author: str = None,
-        keywords: str = None,
         brand: str = None,
+        keywords: str = None,
         title: str = None,
         availability: models.Availability = None,
         browse_node_id: str = None,