format code as code

README.md

@@ -78,13 +78,13 @@ Some examples:
     ip address: 2a01:238:4382:a300:3fe5:41ce:8574:8378
     reverse:    ribe.w21.org
 
-If you feel particularly inquisitive, try the -x option with a
+If you feel particularly inquisitive, try the `-x` option with a
 forward lookup.
 
 The copyright claim and the license conditions in the LICENSE file
 apply to all files of this package.
 
-In the morgue/ subdirectory you can find a shar file of the program
+In the `morgue/` subdirectory you can find a shar file of the program
 from March 1992 and the original README file. Wow, those were the
 days...