Add missing api change in comment

Author: hannesa2

modules/core/src/main/java/com/illposed/osc/argument/OSCImpulse.java

@@ -15,7 +15,7 @@
  * Use like this:
  * <blockquote><pre>{@code
  * OSCMessage msg = new OSCMessage("/my/address");
- * msg.addArgument(OSCImpulse.INSTANCE);
+ * msg.arguments.add(OSCImpulse.INSTANCE);
  * }</pre></blockquote>
  */
 public final class OSCImpulse implements Serializable {