Add auto scroll to end

src/main/java/ChatClient.java

@@ -56,6 +56,7 @@ public class ChatClient extends JFrame implements KeyListener {
             while (true) {
                 String message = fromServerReader.readLine();
                 outputTextArea.append(message + "\n");
+                outputScrollPane.getVerticalScrollBar().setValue(outputScrollPane.getVerticalScrollBar().getMaximum());
             }
         } catch (IOException e) {
             JOptionPane.showMessageDialog(null, "Verbindung zum Server \"" + address + "\" fehlgeschlagen.");