Fix method syntax in logger [ci skip]

lib/paperclip/logger.rb

@@ -2,7 +2,7 @@ module Paperclip
   module Logger
     # Log a paperclip-specific line. This will log to STDOUT
     # by default. Set Paperclip.options[:log] to false to turn off.
-    def log message
+    def log(message)
       logger.info("[paperclip] #{message}") if logging?
     end