add dev dependency on pkg/meta

Author: kevmoo

pubspec.yaml

@@ -15,5 +15,6 @@ dev_dependencies:
   build_runner: ^0.3.2
   build_test: ^0.6.0
   cli_util: '>=0.0.1 <0.2.0'
+  meta: ^1.0.5
   mockito: '>=0.11.0 <3.0.0'
   test: ^0.12.3