Update Travis config
diff --git a/.travis.yml b/.travis.yml
index 4fbf875..269f3ee 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,13 @@
 language: go

 go:

+  - 1.5.4

+  - 1.6.2

   - tip

+

+matrix:

+  allow_failures:

+    - go: tip

+	

 script:

   - go test -v ./...

   - go build