Update ROADMAP.md

update roadmap.

ROADMAP.md

@@ -23,6 +23,6 @@ We hope that the items listed below will inspire further engagement from the com
 - [x] Support `context` in redis related methods for timeout and tracing
 - [x] Support `context` in sql related methods for timeout and tracing
 - [ ] Support `context` in mongodb related methods for timeout and tracing
-- [ ] Add `httpx.Client` with governance, like circuit breaker etc.
+- [x] Add `httpx.Client` with governance, like circuit breaker etc.
 - [ ] Support `goctl doctor` command to report potential issues for given service
 - [ ] Support `goctl mock` command to start a mocking server with given `.api` file