chore: update changelog

CHANGELOG.md

@@ -37,6 +37,10 @@ not. You can now set custom constraints using
 * Add `Table::header_gap` to add some space between the header and the first
 row.
 * Remove `log` from the dependencies
+* Add a way to use a restricted set of unicode symbols in several widgets to
+improve portability in exchange of a degraded output. (see `BarChart::bar_set`,
+`Sparkline::bar_set` and `Canvas::marker`). You can check how the
+`--enhanced-graphics` flag is used in the demos.
 
 ### Breaking Changes
 
@@ -109,6 +113,7 @@ f.render_stateful_widget(list, area, &mut state);
 // In response to some events
 state.select(Some(1));
 ```
+* `widgets::Marker` has been moved to `symbols::Marker`
 
 ## v0.8.0 - 2019-12-15