Minor note added to 2018/endoh2/README.md

The try section actually triggers a long (or infinite? .. didn't check)
loop so I note this and also say how to break out of it (though most
would probably know how).

2018/endoh2/README.md

@@ -29,6 +29,8 @@ make python
 make python3
 ```
 
+NOTE: to interrupt the loop send intr (typically ctrl-C).
+
 ## Judges' comments:
 
 And now for something completely different: A program whose metabolic