Style in RDF.rb is to use parens for method definitions.

Co-Authored-By: Gregg Kellogg <gregg@greggkellogg.net>

Author: doriantaylor

lib/rdf/changeset.rb

@@ -158,7 +158,7 @@ def delete_statement(statement)
 
     # This simply returns its argument as a query in order to trick
     # {RDF::Mutable#delete} into working.
-    def query stmt
+    def query(stmt)
       RDF::Query.new RDF::Query::Pattern.from(stmt)
     end