Test on oldest supported SDK
diff --git a/pkgs/timing/.travis.yml b/pkgs/timing/.travis.yml
index 77141bf..20c457c 100644
--- a/pkgs/timing/.travis.yml
+++ b/pkgs/timing/.travis.yml
@@ -1,13 +1,19 @@
 language: dart
 
 dart:
+  - 2.0.0
   - dev
 
 dart_task:
-- dartfmt
 - dartanalyzer: --fatal-infos --fatal-warnings .
 - test
 
+matrix:
+  include:
+  # Only validate formatting using the dev release
+  - dart: dev
+    dart_task: dartfmt
+
 branches:
   only:
   - master