Fix FastParquetImpl.write for non-existent file

Author: bnaul

pandas/io/parquet.py

@@ -170,7 +170,7 @@ def write(
             # And pass the opened s3file to the fastparquet internal impl.
             kwargs["open_with"] = lambda path, _: path
         else:
-            path, _, _, _ = get_filepath_or_buffer(path)
+            path, _, _, _ = get_filepath_or_buffer(path, mode="wb")
 
         with catch_warnings(record=True):
             self.api.write(