Merge pull request #20 from neolit123/go1.12

CI: only test using 1.12.x

Author: k8s-ci-robot

.travis.yml

@@ -1,13 +1,11 @@
 language: go
 dist: xenial
 go:
-  - 1.10.x
-  - 1.11.x
   - 1.12.x
 script:
   - diff -u <(echo -n) <(gofmt -d *.go)
   - diff -u <(echo -n) <(golint $(go list -e ./...) | grep -v YAMLToJSON)
-  - go vet .
-  - go test -v -race ./...
+  - GO111MODULE=on go vet .
+  - GO111MODULE=on go test -v -race ./...
 install:
   - go get golang.org/x/lint/golint