test.sh: ignore all example* files

.gitignore

@@ -1 +1 @@
-example.txt
+example*

test.sh

@@ -37,7 +37,7 @@ for n in $(seq 1 25); do
 		echo -n "$solution... "
 
 		case "${solution##*/}" in
-			example.txt)
+			example*)
 				echo SKIP
 				continue
 		esac