Add goreleaser to distribute binaries (#460)

See https://github.com/future-architect/vuls/issues/459

.goreleaser.yml

@@ -0,0 +1,31 @@
+project_name: vuls
+release:
+  github:
+    owner: future-architect
+    name: vuls
+builds:
+- goos:
+  - linux
+  - freebsd
+  goarch:
+  - "386"
+  - amd64
+  - arm
+  - arm64
+  goarm:
+  - "6"
+  - "7"
+  main: .
+  ldflags: -s -w -X main.version={{.Version}} -X main.revision={{.Commit}}
+  binary: vuls
+archive:
+  format: tar.gz
+  name_template: '{{ .Binary }}_{{.Version}}_{{ .Os }}_{{ .Arch }}{{ if .Arm }}v{{
+    .Arm }}{{ end }}'
+  files:
+  - LICENSE
+  - NOTICE
+  - README*
+  - CHANGELOG.md
+snapshot:
+  name_template: SNAPSHOT-{{ .Commit }}

.travis.yml

@@ -3,3 +3,5 @@ language: go
 go:
   - 1.8
 
+after_success:
+  - test -n "$TRAVIS_TAG" && curl -sL https://git.io/goreleaser | bash