enable travis CI
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..6788dee
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,19 @@
+language: dart
+sudo: false
+dart:
+  - dev
+  - stable
+  - 1.21.1
+
+dart_task:
+  - test
+  - dartfmt
+  - dartanalyzer
+
+# Only building master means that we don't run two builds for each pull request.
+branches:
+  only: [master]
+
+cache:
+ directories:
+   - $HOME/.pub-cache