Skip tests on dev channel (dart-lang/stream_transform#56)

pkgs/stream_transform/.travis.yml

diff --git a/pkgs/stream_transform/.travis.yml b/pkgs/stream_transform/.travis.yml
index e6d16f6..d18b3db 100644
--- a/pkgs/stream_transform/.travis.yml
+++ b/pkgs/stream_transform/.travis.yml
@@ -2,7 +2,8 @@
 branches:
   only: [master]
 dart:
-  - dev
+  # Skipping dev until Dart 2.1.0-dev is out
+  #- dev
   - stable
 cache:
   directories: