Update Travis CI config

Author: debovema

.travis.yml

@@ -5,6 +5,15 @@ os:
   - linux
 env:
   - GO111MODULE=on
-install: skip  
+install: skip
 script:
+  - GO111MODULE=off go get ./... # to populate $GOPATH/src for tests
+  - go build ./...
   - go test ./...
+deploy:
+- provider: script
+  skip_cleanup: true
+  script: curl -sL https://git.io/goreleaser | bash
+  on:
+    tags: true
+    condition: $TRAVIS_OS_NAME = linux