bump dart ci version

davidmarne · davidmarne · commit fb8d554af3a0 · 2017-07-15T20:49:43.000-06:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,6 @@
 language: dart
 dart:
-  - 1.22.1
+  - 1.24.2
 script:
   - dart tool/build.dart
   - pub run dart_dev format --check
