Implement method for finding current weather by zipcode

README.md

@@ -59,6 +59,9 @@ OpenWeather::Forecast.city("Cochin, IN")
 # get weather forecast by city name in fahrenheit
 OpenWeather::Forecast.city("Cochin, IN", units: 'imperial')
 
+# get weather forecast by zip code
+OpenWeather::Forecast.zip("33704,US")
+
 # get weather forecast by city id
 OpenWeather::Forecast.city_id("1273874")
 
@@ -81,7 +84,7 @@ OpenWeather::ForecastDaily.geocode(9.94, 76.26)
 OpenWeather::ForecastDaily.city_id("1273874", cnt: 6)
 ```
 
-Doucumentation about the weather forecast end-point:
+Documentation about the weather forecast end-point:
 http://openweathermap.org/forecast
 
 #### Using the API key

lib/open_weather/api.rb

@@ -7,6 +7,12 @@ def city(city, options = {})
       new(options.merge(city: city)).retrieve
     end
 
+    #Zip format : 33704,US
+    #Usage: OpenWeather::Current.zip('33704,Us')
+    def zip(zip, options ={})
+      new(options.merge(zip: zip)).retrieve
+    end
+
     # City Id, an integer value. Eg, 2172797
     # Usage: OpenWeather::Current.city_id(2172797)
     def city_id(id, options = {})

lib/open_weather/base.rb

@@ -24,7 +24,7 @@ def success?
     private
 
     def extract_options!(options)
-      valid_options = [ :id, :lat, :lon, :cnt, :city, :lang, :units, :APPID,
+      valid_options = [ :id, :zip, :lat, :lon, :cnt, :city, :lang, :units, :APPID,
         :country, :bbox]
 
       options.keys.each { |k| options.delete(k) unless valid_options.include?(k) }