Update ReadMe.md

Change to reflect that only half-day forecasts are now available due to changes in the SmartThings API weather functions.

ReadMe.md

@@ -4,7 +4,7 @@ Checks for upcoming inclement weather and alerts you if you have doors or window
 
 This SmartThings app is a fork of [Ready for Rain](https://github.com/imbrianj/ready_for_rain), with the following enhancements:
 
-* An option to check the hourly forecast instead of the whole day forecast, which is useful during days with changeable weather.
+* An option to check the half-day forecast instead of the whole day forecast, which is useful during days with changeable weather.
 * The ability to send TTS alerts to a configured media speaker (devices with **capability.musicPlayer**)
 * An option to check and alert on the Air Quality Index via the U.S. EPA [AirNow API](https://docs.airnowapi.org/).
 * An option to check and alert on the pollen index via [Pollen.com](https://www.pollen.com/).