Merge pull request #220 from Yuki-Inoue/patch-1

[proposal] Make src accessible from event object

Author: kimoto

lib/line/bot/event/base.rb

@@ -23,6 +23,10 @@ def initialize(src)
         def [](key)
           @src[key]
         end
+
+        def to_hash
+          @src
+        end
       end
     end
   end