update travis

Signed-off-by: Jess Frazelle <acidburn@jessfraz.com>
diff --git a/.travis.yml b/.travis.yml
index 0c99197..234736e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,7 @@
 language: go
 sudo: false
 go:
-  - 1.10.x
+  - 1.11.x
 before_install:
   - go get golang.org/x/lint/golint
   - go get honnef.co/go/tools/cmd/staticcheck