dart 2 is now available (#32)

truongsinh · yjbanov · commit b01ebf8569db · 2018-12-09T20:28:36.000-08:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,5 +1,5 @@
 language: dart
 dart:
-  # - stable # there's no Dart 2 on the stable channel yet
+  - stable
   - dev
 script: ./tool/presubmit.sh
