Sort out an annoying warning message.

Ruby's warning me about how parentheses are treated as denoting
function arguments.  Which they're being used as here.  But
apparently Ruby thinks I might have been confused.

gurgitate/header.RB

@@ -58,14 +58,14 @@ module Gurgitate
         end
 
         # Extended header
-        def << (text)
+        def << text
             @contents += "\n" + text
         end
 
         # Matches a header's contents.
         # regex::
         #   The regular expression to match against the header's contents
-        def matches (regex)
+        def matches regex
             if String === regex
                 regex = Regexp.new(Regexp.escape(regex))
             end