Merge pull request #9 from hoc081098/renovate/build_runner-2.x

Update dependency build_runner to v2

Author: hoc081098

pubspec.yaml

@@ -37,7 +37,7 @@ dev_dependencies:
   plugin_platform_interface: ^2.0.0
   flutter_test:
     sdk: flutter
-  build_runner: ^1.12.2
+  build_runner: ^2.0.0
   built_value_generator: ^8.0.6
 
 dependency_overrides: