fix readme

README.md

@@ -13,7 +13,7 @@ Built with the [Meltano Tap SDK](https://sdk.meltano.com) for Singer Taps.
 |:--------|:--------:|:-------:|:------------|
 | access_key | True     | None    | Access Key from the CallTrackingMetrics UI. |
 | secret_key | True     | None    | Secret Key from the CallTrackingMetrics UI. |
-| start_date | False    | None    | Formatted as a Unix timestamp. |
+| start_date | False    | None    | The earliest record to sync. |
 | 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. |
 | faker_config | False    | None    | Config for the [`Faker`](https://faker.readthedocs.io/en/master/) instance variable `fake` used within map expressions. Only applicable if the plugin specifies `faker` as an addtional dependency (through the `singer-sdk` `faker` extra or directly). |