Fixed a typo in title

:- )

README.md

@@ -1,8 +1,8 @@
-# Vikunja Cross-Plattform app
+# Vikunja Cross-Platform app
 
 [![Build Status](https://drone.kolaente.de/api/badges/vikunja/app/status.svg)](https://drone.kolaente.de/vikunja/app)
 [![License: MIT](https://img.shields.io/badge/License-MIT-blue.svg)](LICENSE)
 [![Download](https://img.shields.io/badge/download-v0.1-brightgreen.svg)](https://storage.kolaente.de/minio/vikunja-app/)
 [![TestFlight Beta](https://img.shields.io/badge/TestFlight-Beta-026CBB)](https://testflight.apple.com/join/KxOaAraq)
 
-Vikunja as Flutter cross platform app.
+Vikunja as Flutter cross-platform app.

pubspec.yaml

@@ -17,7 +17,7 @@ dependencies:
 dev_dependencies:
   flutter_test:
     sdk: flutter
-  flutter_launcher_icons: "^0.9.0"
+  flutter_launcher_icons: "^0.8.0"
 
 flutter_icons:
   image_path: "assets/vikunja_logo.png"