Only deploy with one version of Go

.travis.yml

@@ -1,14 +1,21 @@
 language: go
 sudo: false
 
+env:
+  - DEPLOY_WITH_MAJOR="1.9"
+
 before_script:
   - go vet ./...
 
 go:
-  - 1.8.5
+  - 1.8.x
-  - 1.9.2
+  - 1.9.x
 
 script: go test -race -v ./...
 
-after_success:
+deploy:
-  - test -n "$TRAVIS_TAG" && curl -sL https://git.io/goreleaser | bash
+  provider: script
+  script: etc/travis-deploy.sh
+  on:
+    tags: true
+    branch: master

etc/travis-deploy.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+# travis-deploy.sh
+# description: Trigger goreleaser deployment in correct build scenarios
+
+set -eo pipefail
+set -x
+
+if [[ "$TRAVIS_GO_VERSION" == "$DEPLOY_WITH_MAJOR."* ]]; then
+  curl -sL https://git.io/goreleaser | bash
+fi