Update Photo object according to latest API

lib/vk/vk_informer_attachment.rb

@@ -45,8 +45,7 @@ def domain_prefix(domain, type = :markdown)
     end
 
     def get_album_image(obj)
-      k = %w[1280 807 604 130 75].find { |x| obj.key? "photo_#{x}".to_sym }
-      k.nil? ? nil : obj["photo_#{k}".to_sym]
+      obj[:sizes].max { |a, b| a[:height] <=> b[:height] }[:url]
     end
   end
 end

spec/fixtures/vk_informer_attachment/album/hash.json

@@ -7,13 +7,15 @@
       "id": 23456,
       "album_id": 12456,
       "owner_id": 123,
-      "photo_75": "http://example.com/photo75.jpg",
-      "photo_130": "http://example.com/photo75.jpg",
-      "photo_604": "http://example.com/photo75.jpg",
-      "photo_807": "http://example.com/photo75.jpg",
-      "photo_1280": "http://example.com/photo75.jpg"
+      "sizes": [
+        { "height": 75, "url": "http://example.com/photo75.jpg" },
+        { "height": 130, "url": "http://example.com/photo130.jpg" },
+        { "height": 604, "url": "http://example.com/photo604.jpg" },
+        { "height": 807, "url": "http://example.com/photo807.jpg" },
+        { "height": 1280, "url": "http://example.com/photo1280.jpg" }
+      ]
     },
     "title": "Album title",
     "description": "Album description"
   }
-}
+}