adding archival note

Author: escamoteur

README.md

@@ -1,3 +1,6 @@
+> This repository is archived, all future development will happen on https://github.com/flutter-it/command_it
+
+
 # flutter_command
 ![Build](https://github.com/escamoteur/flutter_command/workflows/Build/badge.svg)
 [![codecov](https://codecov.io/gh/escamoteur/flutter_command/branch/master/graph/badge.svg)](https://codecov.io/gh/escamoteur/flutter_command)

example/pubspec.lock

@@ -44,7 +44,7 @@ packages:
       path: ".."
       relative: true
     source: path
-    version: "7.0.1"
+    version: "7.2.2"
   flutter_lints:
     dependency: "direct dev"
     description: