Removes the final modifier from SerialPort. This class only has a pri…

…vate constructor which makes it effectively final. Also, removing the final modifier allows for easier mocking for unit testing.

src/main/java/com/fazecast/jSerialComm/SerialPort.java

@@ -49,7 +49,7 @@
  * @see java.io.OutputStream
  */
 @SuppressWarnings("unused")
-public final class SerialPort
+public class SerialPort
 {
 	// Parity Values
 	static final public int NO_PARITY = 0;