add goreleaser deploy to travis

.gitignore

@@ -1 +1 @@
-bin/
+dist/

.goreleaser.yml

@@ -0,0 +1,12 @@
+builds:
+  - env:
+      - CGO_ENABLED=0
+    main: ./cmd/tengo/main.go
+    goos:
+      - darwin
+      - linux
+      - windows
+checksum:
+  name_template: 'checksums.txt'
+changelog:
+  sort: asc

.travis.yml

@@ -8,3 +8,10 @@ install:
 
 script:
   - make test
+
+deploy:
+  - provider: script
+    skip_cleanup: true
+    script: curl -sL https://git.io/goreleaser | bash
+    on:
+      tags: true