nits

example/transformer/hello_app/pubspec.yaml

diff --git a/example/transformer/hello_app/pubspec.yaml b/example/transformer/hello_app/pubspec.yaml
index 8770a06..f77ab0b 100644
--- a/example/transformer/hello_app/pubspec.yaml
+++ b/example/transformer/hello_app/pubspec.yaml
@@ -4,7 +4,6 @@
   ddc_example_transformer_dep:
     path: ../hello_dep
 dev_dependencies:
-  barback: any
   dev_compiler:
     path: ../../..
 transformers:

pubspec.yaml

diff --git a/pubspec.yaml b/pubspec.yaml
index daf5c11..de50cd1 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -11,7 +11,7 @@
 dependencies:
   analyzer: ^0.27.1+2
   barback: ^0.15.2+7
-  code_transformers: 0.4.0
+  code_transformers: ^0.4.0
   args: ^0.13.0
   cli_util: ^0.0.1
   crypto: ^0.9.0