* @param {Date|Number} date - the date to be changed
* @param {Number} amount - the amount of weeks to be added. Positive decimals will be rounded using `Math.floor`, decimals less than zero will be rounded using `Math.ceil`.
* @returns {Date} the new date with the weeks added
* @throws {TypeError} 2 arguments required
*
* @example
* // Add 4 weeks to 1 September 2014:
* const result = addWeeks(new Date(2014, 8, 1), 4)