update travis build too
diff --git a/.travis.yml b/.travis.yml
index 75db9cc..73b3221 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -14,8 +14,8 @@
 branches:
   only:
     - master
+    - "2.8"
     - "2.7"
-    - "2.6"
 
 env:
   global: