Merge pull request #5 from freshcn/develop

只有打tag的时候，才编译

Author: freshcn

.travis.yml

@@ -40,4 +40,4 @@ deploy:
     skip_cleanup: true
     on:
         condition: $TRAVIS_GO_VERSION =~ ^1\.7\.[0-9]+$
-        # tags: true
+        tags: true