Renamed checkForDataPresence, reflecting its expanded role

README.md

@@ -70,6 +70,7 @@ code that uses data from [OpenWeathermap.org](https://openweathermap.org).
        data set
      - [*"onecall"*](https://openweathermap.org/api/one-call-api), the "One
        Call API" data set
+       - Includes *onecall/timemachine*
      - [*forecast*](https://openweathermap.org/forecast5), the 5-day/3-hour
        forecast data set
      - [*air_pollution*](https://openweathermap.org/api/air-pollution), the air
@@ -85,8 +86,8 @@ code that uses data from [OpenWeathermap.org](https://openweathermap.org).
   support the subscription-based APIs.
 - As of this writing, `OpenWeatherConnector` only supports the *"weather"*,
   *"forecast*, *"air_pollution"*, *"air_pollution/forecast"*, and
-  *"air_pollution/history"* data sets. We plan to add support for the
-  *"onecall"* data set.
+  *"air_pollution/history"* datasets. We plan to add support for the
+  *"onecall"* and the *onecall/timemachine* datasets.
 - We may add support for the
   [Geocoding API](https://openweathermap.org/api/geocoding-api) (*"direct"* and
   *"reverse"* data sets).