update travis tests for new go version
diff --git a/.travis.yml b/.travis.yml
index 04f05e1..44cd0e2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,8 +4,8 @@
 # current and previous stable releases, plus tip
 # remember to exclude previous and tip for macs below
 go:
-  - 1.9.x
   - 1.10.x
+  - 1.11.x
   - tip
 
 os:
@@ -15,7 +15,7 @@
 matrix:
   exclude:
     - os: osx
-      go: 1.9.x
+      go: 1.10.x
     - os: osx
       go: tip