Version up go in travis

.travis.yml

@@ -5,7 +5,10 @@ services:
 language: go
 go:
   - tip
-  - "1.10"
+  - "1.11"
+
+env:
+  - GO111MODULE=on
 
 cache:
   directories:
@@ -18,12 +21,10 @@ before_script:
   - touch ~/.ssh/known_hosts
   # for coverage report
   - go get github.com/mattn/goveralls
-  # using vgo for resolve dependencies
-  - go get golang.org/x/vgo
 script:
-  - vgo test -coverprofile cover.out $(vgo list ./... | grep -v mock_)
+  - go test -coverprofile cover.out $(go list ./... | grep -v mock_)
 after_success:
-  - if [ "$TRAVIS_GO_VERSION" = "1.10" ]; then goveralls -service=travis-ci -coverprofile=cover.out -ignore=main.go; fi
+  - if [ "$TRAVIS_GO_VERSION" = "1.11" ]; then goveralls -service=travis-ci -coverprofile=cover.out -ignore=main.go; fi
 before_deploy:
   - go get all
   - go get golang.org/x/sys/windows
@@ -36,4 +37,4 @@ deploy:
     script: goreleaser --release-notes=release-notes.txt
     on:
       tags: true
-      condition: $TRAVIS_GO_VERSION = "1.10"
+      condition: $TRAVIS_GO_VERSION = "1.11"