fix maxBarValue not updated in a timely manner

[junerver]

示例中添加新的柱状图数据时，没有更新最大值限定，导致require 代码块抛出异常

或者可以考虑将该字段直接移除

data class BarChartData(
    val bars: List<Bar>,
    val padBy: Float = 10F,
    val startAtZero: Boolean = true,
) {

    init {
        require(padBy in 0F..FLOAT_100) {
            "padBy must be between 0F and 100F, included"
        }
    }

    internal val maxBarValue: Float
        get() = bars.maxOf { it.value }

    private val yMinMaxValues: Pair<Float, Float>
        get() {
            val minValue = bars.minOf { it.value }
            val maxValue = maxBarValue
            return minValue to maxValue
        }

    val maxY: Float
        get() = yMinMaxValues.second + (yMinMaxValues.second - yMinMaxValues.first) * padBy / FLOAT_100
    val minY: Float
        get() = if (startAtZero) 0F
        else yMinMaxValues.first - (yMinMaxValues.second - yMinMaxValues.first) * padBy / FLOAT_100

    data class Bar(
        val value: Float,
        val color: Color,
        val label: String
    )
}