Update screenshots in the readme. (#967)

Author: xStrom

CHANGELOG.md

@@ -125,6 +125,7 @@ This means that druid no longer requires cairo on macOS and uses Core Graphics i
 - Added new example for blocking functions. ([#840] by [@mastfissh])
 - Added a changelog containing development since the 0.5 release. ([#889] by [@finnerale])
 - Removed references to cairo on macOS. ([#943] by [@xStrom])
+- Updated screenshots in `README.md`. ([#967] by [@xStrom])
 
 ### Maintenance
 
@@ -215,6 +216,7 @@ This means that druid no longer requires cairo on macOS and uses Core Graphics i
 [#959]: https://github.com/xi-editor/druid/pull/959
 [#961]: https://github.com/xi-editor/druid/pull/961
 [#963]: https://github.com/xi-editor/druid/pull/963
+[#967]: https://github.com/xi-editor/druid/pull/967
 
 ## [0.5.0] - 2020-04-01
 

README.md

@@ -58,11 +58,9 @@ druid's existing functionality and widgets.
 
 ## Screenshots
 
-#### Linux
-[![calc.rs example](https://raw.githubusercontent.com/xi-editor/druid/screenshots/images/calc.png)](./druid/examples/calc.rs)
-[![custom_widget.rs example](https://raw.githubusercontent.com/xi-editor/druid/screenshots/images/custom_widget.png)](./druid/examples/custom_widget.rs)
-[![hello.rs example](https://raw.githubusercontent.com/xi-editor/druid/screenshots/images/hello.png)](./druid/examples/hello.rs)
-[![slider.rs example](https://raw.githubusercontent.com/xi-editor/druid/screenshots/images/slider.png)](./druid/examples/slider.rs)
+[![calc.rs example](https://raw.githubusercontent.com/xi-editor/druid/screenshots/images/0.6.0/calc.png)](./druid/examples/calc.rs)
+[![flex.rs example](https://raw.githubusercontent.com/xi-editor/druid/screenshots/images/0.6.0/flex.png)](./druid/examples/flex.rs)
+[![custom_widget.rs example](https://raw.githubusercontent.com/xi-editor/druid/screenshots/images/0.6.0/custom_widget.png)](./druid/examples/custom_widget.rs)
 
 ## Concepts