Update README.md

Author: LukeProducts

README.md

@@ -161,7 +161,7 @@ __barriers__ (f.ex. '#') and __walkable terrain__ (f.ex. ' ') <br>
 is converted to a maze out of zeroes and ones, <br>
 the ones represent the not walkable terrain and the zeroes the walkable terrain by default. <br><br>
 All this settings could be adjusted in the __#define__ statements at the beginning of this package.<br><br>
-<iframe src="https://github.com/LukeProducts/AStar-Pathfinding-Cpp/blob/14c2a2b6773bd87094b09eae8189e36539831fc7/examples/prepare_maze.cpp#L7-L32">
+<a href="https://github.com/LukeProducts/AStar-Pathfinding-Cpp/blob/14c2a2b6773bd87094b09eae8189e36539831fc7/examples/prepare_maze.cpp#L7-L32"></a>
 
 ```
 ########## -----> 1111111111