Merge pull request #69 from ludoza/patch-1

fixed simple example.

src/main/java/net/schmizz/sshj/SSHClient.java

@@ -103,6 +103,7 @@ import java.util.List;
  *          cmd.join(1, TimeUnit.SECONDS);
  *     } finally {
  *          session.close();
+ *     }
  * } finally {
  *      client.disconnect();
  * }