Update README.md

README.md

@@ -1,11 +1,15 @@
+## Array Diff
+
 Your goal in this kata is to implement a difference function, which subtracts
 one list from another and returns the result.
 
 It should remove all values from list a, which are present in list b keeping
 their order.
+```
+array_diff(vec![1,2], vec![1]) == vec![2]
+```
+If a value is present in b, all of its occurrences must be removed from the other:
 
-array_diff(vec![1,2], vec![1]) == vec![2] If a value is present in b, all of its
-occurrences must be removed from the other:
-
+```
 array_diff(vec![1,2,2,2,3], vec![2]) == vec![1,3]
-
+```