Use gox output param instead of manually moving binaries

Author: Josh Godsiff

.travis.yml

@@ -20,13 +20,9 @@ install:
   - cd $GOPATH/src/github.com/Masterminds/glide && git checkout v0.13.1 && go install && cd -
   - glide install
 script:
-  - gox -os "freebsd darwin linux windows" -arch "386 amd64"
+  - gox -os "freebsd darwin linux windows" -arch "386 amd64" -output="terraform-provider-elasticsearch_${TRAVIS_TAG}_{{.OS}}_{{.Arch}}"
   - wget -q --waitretry=1 --retry-connrefused -T 10 -O - $ELASTICSEARCH_URL
   - TF_ACC=1 go test -v -cover
-before_deploy: |
-  # rename to match terraform provider conventions:
-  #  https://www.terraform.io/docs/configuration/providers.html#third-party-plugins
-  for file in terraform-provider-elasticsearch*; do mv "$file" "${file}_${TRAVIS_TAG}"; done
 deploy:
   provider: releases
   api_key: