add Yahoo! Weather API

README.md

@@ -121,6 +121,7 @@ A collective list of JSON APIs for use in web development.
 | NASA | NASA data, including imagery | No | [Go!](https://api.nasa.gov) |
 | Wunderground | Weather | No | [Go!](http://www.wunderground.com/weather/api/) |
 | OpenWeatherMap | Weather | No | [Go!](http://openweathermap.org/api) |
+| Yahoo! Weather | Weather | No | [Go!](https://developer.yahoo.com/weather/) |
 | World Bank | World Data | No | [Go!](http://data.worldbank.org/developers) |
 | Open Notify | ISS astronauts, current location API | No | [Go!](http://open-notify.org/Open-Notify-API/) |
 | Fedger.io | Query machine intelligence data | No | [Go!](https://dev.fedger.io/docs/) |