Update README.md (dart-lang/lints#33)

diff --git a/pkgs/lints/README.md b/pkgs/lints/README.md
index 45b9139..243e050 100644
--- a/pkgs/lints/README.md
+++ b/pkgs/lints/README.md
@@ -49,7 +49,7 @@
 the lints package:
 
 ```yaml
-include: package:lints/core.yaml
+include: package:lints/recommended.yaml
 ```
 
 ## Customizing the pre-defined lint sets