md syntax fix

README.md

@@ -90,9 +90,10 @@ To make a task considered complete and to move on the next one, return 1.
 
 #### Variables
 When inside module scripts the following variables will be defined for you:
-
-`BASHTUTOR_R     : the return value of the user's last command`
-`BASHTUTOR_PS1   : the primary prompt bashtutor uses`
+```
+BASHTUTOR_R     : the return value of the user's last command
+BASHTUTOR_PS1   : the primary prompt bashtutor uses
+```
 
 Along side with the following, which all represent ANSI escape sequences:
 + `NORMAL`