build: remove TravisCI config

Change-Id: I4860259ab76f9e4db0ff3dffaa10962a64967634
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 90ed624..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,8 +0,0 @@
-language: go
-go:
-- 1.9.x
-go_import_path: drive.upspin.io
-script: go test -short -race ./...
-notifications:
-  email:
-  - upspin-reviews@googlegroups.com