adding N to 'consumes reference' as it should just print the N in the read

Author: guilhermesena1

cigar_utils.hpp

@@ -25,6 +25,7 @@ consumes_query(const char op) {
   return ((op == 'M') ||
           (op == 'I') ||
           (op == 'S') ||
+          (op == 'N') ||
           (op == '=') ||
           (op == 'X'));
 }