chore: change version to 1.0.0-rc.1

DT-3586

Author: matejglejtek

pubspec.yaml

@@ -1,6 +1,6 @@
 name: flutter_opendroneid
 description: A flutter plugin for reading Wi-Fi and Bluetooth Remote ID advertisements using native Android and iOS platform-specific implementation.
-version: 0.21.0
+version: 1.0.0-rc.1
 repository: https://github.com/dronetag/flutter-opendroneid
 environment:
   sdk: ">=3.0.0 <4.0.0"