updated `vendor.json` is ok.
but set `ignore test` in `vendor.json`, `x/net/context` package only use in `context_test.go`, I don't know why vendor still need it.
please @appleboy review the pull request, thanks a lot.
* update json-iterator revison to fix TestRenderIndentedJSON failed
* fix(test): add space between key and value as same as standard JSON.
* fix(test): add space between key and value as same as standard JSON.
* Add new function to Render interface for writing content type only
* Add support for the new function in Render interface for writing content-type only
* Fix unhandled merge conflict in context_test.go
* Update vendor.json