fix(pandas): update compatibility (#28)

* Instead of directly appending a dictionary to the DataFrame, we create a new DataFrame called new_row that contains the data we want to add

We use pd.concat() to concatenate the original DataFrame (frame) with the new DataFrame (new_row). The ignore_index=True parameter ensures that the index is reset after concatenation

* Added more descriptive comments on the changes that I made

* Update __init__.py

Author: sxcntqnt

dgraphpandas/__init__.py

@@ -1,5 +1,5 @@
 __name__ = 'dgraphpandas'
-__version__ = '0.1.4'
+__version__ = '0.1.5'
 __description__ = 'Transform Pandas DataFrames into Exports to be sent to DGraph'
 
 from dgraphpandas.rdf import to_rdf  # noqa

dgraphpandas/strategies/schema.py

@@ -137,7 +137,10 @@ def create_schema(source_config: Union[str, Dict[str, Any]], output_dir='.', **k
 
     logger.debug('Appending xid declaration')
     if ensure_xid_predicate:
-        frame = frame.append({'column': 'xid', 'type': 'string', 'table': None, 'options': '@index(exact)'}, ignore_index=True)
+        # Create a new DataFrame for the row to be added
+        new_row = pd.DataFrame([{'column': 'xid', 'type': 'string', 'table': None, 'options': '@index(exact)'}])
+        # Use pd.concat to add the new row
+        frame = pd.concat([frame, new_row], ignore_index=True)
 
     frame.sort_values(by=['table', 'type'], inplace=True)
     frame.reset_index(inplace=True, drop=True)