Bump version to 0.46.0

[imaNNeo]

• BUGFIX Fix drawing BetweenBarsArea problem when there are nullSpots in fromLine and toLine, LineChart breaks with nullSpot values #912.
• FEATURE Allow to have vertically grouped BarChart using fromY and toY properties in BarChartRodData It means you can have a negative and a positive bar chart at the same X location. Negative and Positive bar on the same index of x axis in Bar Chart #334, Is "ranged bar chart" supported (Apple pulsation chart type) ? #875. Check BarChartSample5 and [BarChartSample6](https://github.com/imaNNeoFighT/fl_chart/blob/master/repo_files/documentations/bar_chart.md#sample-6-source-code.
• BREAKING Renamed y property to toY in BarChartRodData and BackgroundBarChartRodData due to the above feature.
• BUGFIX Fix smaller radius bubble hiding behind bigger radius bubble in ScatterChart, Smaller radius bubble hidden behind larger radius bubble #930.
• BUGFIX Fix tooltip text alignment and direction in line chart, text direction and text alignment ignored in line chart tooltip implementation #927.

[codecov]

Codecov Report

Merging #941 (20add1b) into master (44d4877) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #941   +/-   ##
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  Coverage   81.41%   81.41%           
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  Files          34       34           
  Lines        3083     3083           
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  Hits         2510     2510           
  Misses        573      573           

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