Fetch goreleaser via curl instead of 'go get' as compilation only wor…

…ks in 1.10 (#387)

.travis.yml

@@ -49,7 +49,6 @@ before_script:
   - go get honnef.co/go/tools/cmd/megacheck                     # Badass static analyzer/linter
   - go get github.com/fzipp/gocyclo
   - go get github.com/mattn/goveralls
-  - go get github.com/goreleaser/goreleaser
 
 # script always run to completion (set +e). All of these code checks are must haves
 # in a modern Go project.
@@ -66,4 +65,4 @@ script:
 # goreleaser will run if the latest version tag matches the current commit
 after_success:
   - $GOPATH/bin/goveralls -coverprofile=profile.cov -service=travis-ci
-  - if [[ "$TRAVIS_SECURE_ENV_VARS" == true && "$TRAVIS_GO_VERSION" == "1.9.2" ]]; then docker login -u "$DOCKER_USERNAME" -p "$DOCKER_PASSWORD"; goreleaser; fi
+  - if [[ "$TRAVIS_SECURE_ENV_VARS" == true && "$TRAVIS_GO_VERSION" == "1.9.2" ]]; then docker login -u "$DOCKER_USERNAME" -p "$DOCKER_PASSWORD"; curl -sL https://git.io/goreleaser | bash; fi