Documentation updated with added parameter options to all functions

Author: sanipym

README.md

@@ -45,7 +45,7 @@ OpenWeather::Current.city_id("1273874", options)
 OpenWeather::Current.geocode(9.94, 76.26 , options)
 
 # get current weather for a list of city ids
-OpenWeather::Current.cities([524901, 703448, 2643743])
+OpenWeather::Current.cities([524901, 703448, 2643743], options)
 
 # get current weather for a bounding box
 OpenWeather::Current.rectangle_zone(12, 32, 15, 37, 10)