message: ts-custom-error test
diff: +import { CustomError } from 'ts-custom-error';
  +
  /**
  * Custom Error class of type Exception.
  */
  -class Exception {
  +export default class Exception extends CustomError {
  /**
  * Allows Exception to be constructed directly
  * with some message and prototype definition.
  */
  - public constructor(
  - public message: string = ''
  + constructor(
  + public message: string = 'A exception has occoured.'
  ) {
  - Error.apply(this, arguments);
  + super(message);
  }
  }
  -
  -Exception.prototype = new Error();
  -
  -export default Exception;
  