test 'markdown' block instead of 'console' for shell output

README.md

@@ -2,7 +2,7 @@
 
 `lceb` will find the best solutions(s) for the
 [Numbers part of the Countdown game](https://en.wikipedia.org/wiki/Countdown_(game_show)#Numbers_round)
-"[_Le compte est Bon_](https://fr.wikipedia.org/wiki/Des_chiffres_et_des_lettres#Le_Compte_est_Bon)" in French).
+("[*Le Compte est Bon*](https://fr.wikipedia.org/wiki/Des_chiffres_et_des_lettres#Le_Compte_est_Bon)" in French).
 
 ## Requisites
 
@@ -21,7 +21,7 @@ To display more debug information, you may first enable some DEBUG flags in the
 ```makefile
 CFLAGS:=$(CFLAGS) -DDEBUG              #     general (signal handler, etc...)
 CFLAGS:=$(CFLAGS) -DDEBUG_MAIN         #     general information in main
-#CFLAGS:=$(CFLAGS) -DDEBUG_MAINSLEEP    #     sleep 1 sec within main loop (SIGINTR test)
+#CFLAGS:=$(CFLAGS) -DDEBUG_MAINSLEEP    #     sleep 1 sec within main loop
 #CFLAGS:=$(CFLAGS) -DDEBUG_MAINLOOP     #     main loop (do not use this!)
 #CFLAGS:=$(CFLAGS) -DDEBUG_TIMER        #     timer
 #CFLAGS:=$(CFLAGS) -DDEBUG_SIGNAL       #     signal
@@ -37,16 +37,17 @@ CFLAGS:=$(CFLAGS) -DDEBUG_MEM          #     malloc
 ```
 
 To build the binaries just run:
-```console
+
-$ make lceb
+``` markdown
+**$ make lceb**
 ```
 
 ## Usage
 
 ### basic usage and output
 
-```console
+```markdown
-$ ./lceb 2 7 1 7 8 8
+**$ ./lceb 2 7 1 7 8 8**
 timer started...
 mem: allocating operators working area (5 bytes)
 new_stack: allocating 1024 stacks