Change SmartyStreets Zipcode API

SmartyStreets is permanently changing their ZIP Code API endpoint by
June 22 at 9am Mountain Time.  The legacy API endpoint is available
until the 22nd.

This change basically changes the API endpoint and updated the tests to
reflect the change.

lib/geocoder/lookups/smarty_streets.rb

@@ -12,8 +12,11 @@ module Geocoder::Lookup
     end
 
     def query_url(query)
-      path = zipcode_only?(query) ? "zipcode" : "street-address"
-      "#{protocol}://api.smartystreets.com/#{path}?#{url_query_string(query)}"
+      if zipcode_only?(query)
+        "#{protocol}://us-zipcode.api.smartystreets.com/lookup?#{url_query_string(query)}"
+      else
+        "#{protocol}://api.smartystreets.com/street-address?#{url_query_string(query)}"
+      end
     end
 
     # required by API as of 26 March 2015

test/unit/lookups/smarty_streets_test.rb

@@ -21,12 +21,12 @@ class SmartyStreetsTest < GeocoderTestCase
 
   def test_query_for_zipcode_geocode
     query = Geocoder::Query.new("22204")
-    assert_match(/api\.smartystreets\.com\/zipcode\?/, query.url)
+    assert_match(/us-zipcode\.api\.smartystreets\.com\/lookup\?/, query.url)
   end
 
   def test_query_for_zipfour_geocode
     query = Geocoder::Query.new("22204-1603")
-    assert_match(/api\.smartystreets\.com\/zipcode\?/, query.url)
+    assert_match(/us-zipcode\.api\.smartystreets\.com\/lookup\?/, query.url)
   end
 
   def test_smarty_streets_result_components