Use explicit go version

Author: Jakub Knejzlik

.travis.yml

@@ -1,5 +1,8 @@
 language: go
 
+go:
+  - "1.10"
+
 services:
   - docker
 
@@ -11,8 +14,7 @@ script:
   - make build tag push
 
 after_success:
-  - env
-  - if [ "${TRAVIS_TAG}" != "" ] && [ "${TRAVIS_GO_VERSION}" == "1.7" ]; then gox -output "dist/{{.Dir}}-{{.OS}}-{{.Arch}}";fi
+  - if [ "${TRAVIS_TAG}" != "" ] && [ "${TRAVIS_GO_VERSION}" == "1.10" ]; then gox -output "dist/{{.Dir}}-{{.OS}}-{{.Arch}}";fi
 
 deploy:
   provider: releases