Merge pull request bregman-arie#25 from iCHAIT/patch-1

[Python - Hello World] Fix link to hello_world.md solution

Author: bregman-arie

exercises/hello_world/hello_world.md

@@ -10,4 +10,4 @@ Hello
   World
 ```
 
-Click [here to view the solution](../../solutions/hello_world.md)
+Click [here to view the solution](../../solutions/hello_world/hello_world.md)