Merge pull request #28 from haoxins/haoxins-patch-1

travis++
diff --git a/.travis.yml b/.travis.yml
index 9398694..5c7621e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,4 +8,6 @@
   - 1.2
   - 1.3
   - 1.4
+  - 1.5
+  - 1.6
   - tip