build: add TravisCI configuration file

Change-Id: I1e649f3d4ca7573385759bc2d92332dbde67533a
Reviewed-on: https://upspin-review.googlesource.com/8960
Reviewed-by: Rob Pike <r@golang.org>
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..bfbddcd
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,5 @@
+language: go
+go:
+- 1.8.x
+go_import_path: gcp.upspin.io
+script: go test -short -race ./...