Update README.md

Author: Dmitriy-Gonchar

README.md

@@ -1,13 +1,13 @@
 ### Initial free() use:
 
-free(a);
+```free(a);
 
 free(b);
 
 ...
 
-free(z);
+free(z);```
 
 ### This macros free() use:
 
-free(a, b, ... z);
+```FREE(a, b, ... z);```