Update CHANGELOG.md

CHANGELOG.md

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+## newVersion
+[IMPROVEMENT] Added [Radar Chart Documentations](https://github.com/imaNNeoFighT/fl_chart/blob/master/repo_files/documentations/radar_chart.md)
+[IMPROVEMENT] Added `textAlign` property in the [BarTooltipItem](https://github.com/imaNNeoFighT/fl_chart/blob/master/repo_files/documentations/bar_chart.md#bartooltipitem), and [LineTooltipItem](https://github.com/imaNNeoFighT/fl_chart/blob/master/repo_files/documentations/line_chart.md#linetooltipitem), default is `TextAlign.center`.
+[IMPROVEMENT] Added `direction` property in the [BarTouchTooltipData](https://github.com/imaNNeoFighT/fl_chart/blob/master/repo_files/documentations/bar_chart.md#bartouchtooltipdata), and [LineTouchTooltipData](https://github.com/imaNNeoFighT/fl_chart/blob/master/repo_files/documentations/line_chart.md#linetouchtooltipdata) to specify the position of the tooltip (can be `auto`, `top`, `bottom`), default is `auto`.
+[BREAKING] Renamed `tooltipBottomMargin` to `tooltipMargin` property in the [BarTouchTooltipData](https://github.com/imaNNeoFighT/fl_chart/blob/master/repo_files/documentations/bar_chart.md#bartouchtooltipdata), and [LineTouchTooltipData](https://github.com/imaNNeoFighT/fl_chart/blob/master/repo_files/documentations/line_chart.md#linetouchtooltipdata)
+
 ## 0.20.1
 * [BREAKING] We now support flutter version 2.0 (null-safety), check out the [migration guide](https://dart.dev/null-safety/migration-guide).
 * [NEW_CHART] We have added [RadarChart](https://github.com/payam-zahedi/fl_chart/blob/master/repo_files/documentations/radar_chart.md). Thanks to [Payam Zahedi](https://github.com/payam-zahedi)!