[#242] Add lint into dangerfile

Author: doannimble

bricks/template/__brick__/dangerfile.dart

@@ -1,7 +1,3 @@
-import 'package:danger_core/danger_core.dart';
-
-void main() {
-  if (danger.github.pr.title.contains('WIP')) {
-    warn('PR is considered WIP');
-  }
-}
+flutter_lint.only_modified_files = true
+flutter_lint.report_path = "flutter_analyze_report.txt"
+flutter_lint.lint(inline_mode: true)