Force method to return boolean value.

lib/geocoder.rb

@@ -82,7 +82,7 @@ module Geocoder
   # dot-delimited 8-bit numbers.
   #
   def ip_address?(value)
-    value.match /^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/
+    !!value.match(/^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/)
   end
 
   ##