Minor changes

Exercise2/Exercise2.java

+package fi.utu.tech.ooj.exercise2.teht2;
+
+import java.io.IOException;
+
+public class Teht2 {
+    public Teht2() {
+        System.out.println("Tehtävä 2");
+
+        try (var zipper = new TestZipper2("books.zip")) {
+            zipper.run();
+        } catch (IOException e) {
+            System.err.println("Ajo epäonnistui!");
+            e.printStackTrace();
+        }
+    }
+}