add fetch_size to readme

README.md

@@ -51,6 +51,7 @@ pipx install git+https://github.com/datarts-tech/tap-cassandra.git@main
 | reconnect_delay     | False    |      60 | Floating point number of seconds to wait inbetween each attempt. |
 | max_attempts        | False    |       5 | Should be a total number of attempts to be made before giving up. |
 | protocol_version    | False    |      65 | The maximum version of the native protocol to use. |
+| fetch_size          | False    |   10000 | The fetch size when syncing data from Cassandra. |
 | stream_maps         | False    | None    | Config object for stream maps capability. For more information check out [Stream Maps](https://sdk.meltano.com/en/latest/stream_maps.html). |
 | stream_map_config   | False    | None    | User-defined config values to be used within map expressions. |
 | flattening_enabled  | False    | None    | 'True' to enable schema flattening and automatically expand nested properties. |