Raise sdk constraints to 2.2 in example app

moor_flutter/example/lib/database/database.dart

@@ -66,9 +66,9 @@ class Database extends _$Database {
     // each category
     return customSelectStream(
       'SELECT c.*, (SELECT COUNT(*) FROM todos WHERE category = c.id) AS amount'
-          ' FROM categories c '
-          'UNION ALL SELECT null, null, '
-          '(SELECT COUNT(*) FROM todos WHERE category IS NULL)',
+      ' FROM categories c '
+      'UNION ALL SELECT null, null, '
+      '(SELECT COUNT(*) FROM todos WHERE category IS NULL)',
       readsFrom: {todos, categories},
     ).map((rows) {
       // when we have the result set, map each row to the data class

moor_flutter/example/pubspec.yaml

@@ -4,7 +4,7 @@ description: A todo list application that uses moor to store data
 version: 1.0.0+1
 
 environment:
-  sdk: ">=2.0.0-dev.68.0 <3.0.0"
+  sdk: ">=2.2.0 <3.0.0"
 
 dependencies:
   flutter: