Update README.markdown

Author: gazolla

Stack/README.markdown

@@ -2,7 +2,7 @@
 
 Stack is an abstract data type that serves as a collection of elements, with two principal operations: push, which adds an element to the collection, and pop, which removes the most recently added element that was not yet removed. The order in which elements come off a stack gives rise to its alternative name, LIFO (for last in, first out). Additionally, a peek operation may give access to the top without modifying the stack.
 
-![](https://github.com/gazolla/Kotlin-Algorithm/tree/master/Stack/Lifo_stack.png)
+![](https://github.com/gazolla/Kotlin-Algorithm/blob/master/Stack/Lifo_stack.png)
 
 ## The code