add .travis.yml
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..f90b4a9
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,9 @@
+language: go
+go_import_path: github.com/pkg/errors
+go:
+  - 1.5.2
+  - 1.4.3
+  - tip
+
+script:
+  - go test -v ./...