Update .travis.yml
diff --git a/.travis.yml b/.travis.yml
index 781bdf2..26122d3 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,7 @@
 language: dart
 
 dart:
-  - preview/raw/2.10.0-0.2-dev
+  - dev
 
 script: ./tool/travis.sh