Unset $offset variable

https://github.com/grimzy/laravel-mysql-spatial/blob/e17f4915996c8d3c285b9cca310069642593da2a/src/Types/PointCollection.php#L64-L71

	public function insertPoint($index, Point $point)
	{
	if (count($this->points) - 1 < $index) {
	throw new InvalidArgumentException('$index is greater than the size of the array');
	}

	array_splice($this->points, $offset, 0, [$point]);
	}

Provide feedback