Fix script-02.sh solution.

Author: anosidium

individual-shell-tools/cat/script-02.sh

@@ -12,4 +12,4 @@ set -euo pipefail
 # I was tempted to take a bite of it.
 # But this seemed like a bad idea...
 
-cat ../helper-files/helper-1.txt ../helper-files/helper-2.txt ../helper-files/helper-3.txt
+cat ../helper-files/*