fix showcase project : Plural Planner ,name & url
Plural Planner project url is changed,
old:
new:
@@ -399,7 +399,7 @@ There is a (wip) OrbTk book check [OrbTk book](https://github.com/redox-os/orbtk
## Showcases
-* [Plural Planner](https://codeberg.org/PluralTools/Planner): Task app
+* [Plural Planner](https://codeberg.org/PluralTools/Plural): Task app
* [Kanter](https://github.com/lukors/kanter): Node based texture editor
* [twin-commander](https://github.com/kivimango/twin-commander): A twin-panel file manager specifically for the Redox OS
* [Space Editor](https://codeberg.org/flovanco/space-editor): 2D Tile Map Editor compatible with OrbGame
