make BLACK LIVES MATTER bold

CHANGELOG.md

@@ -1,5 +1,5 @@
 ## 0.10.0
-* [IMPORTANT] BLACK LIVES MATTER
+* [IMPORTANT] **BLACK LIVES MATTER**
 * [Improvement] Auto calculate interval in [SideTitles](https://github.com/imaNNeoFighT/fl_chart/blob/master/repo_files/documentations/base_chart.md#sidetitles) and [FlGridData](https://github.com/imaNNeoFighT/fl_chart/blob/master/repo_files/documentations/base_chart.md#flgriddata), instead of hard coding 1, to prevent some performance issues like #101, #322. see [BarChartSample4](https://github.com/imaNNeoFighT/fl_chart/blob/master/repo_files/documentations/bar_chart.md#sample-4-source-code).
 * [Bugfix] drawing dot on null spots
 * [Bugfix] Fixed LineChart have multiple NULL spot bug.