Update README.md

Author: you-n-g

README.md

@@ -45,7 +45,6 @@ New features under development(order by estimated release time).
 Your feedbacks about the features are very important.
 | Feature                        | Status      |
 | --                      | ------    |
-| Online serving and automatic model rolling | Under review: https://github.com/microsoft/qlib/pull/290 | 
 | Planning-based portfolio optimization | Under review:  https://github.com/microsoft/qlib/pull/280 | 
 | Fund data supporting and analysis  |  Under review: https://github.com/microsoft/qlib/pull/292 |
 | Point-in-Time database | Under review: https://github.com/microsoft/qlib/pull/343 |
@@ -55,6 +54,7 @@ Your feedbacks about the features are very important.
 Recent released features
 | Feature | Status |
 | --                      | ------    |
+| Online serving and automatic model rolling | Released: https://github.com/microsoft/qlib/pull/290 | 
 | DoubleEnsemble Model | Released https://github.com/microsoft/qlib/pull/286 | 
 | High-frequency data processing example | Released https://github.com/microsoft/qlib/pull/257 |
 | High-frequency trading example | Part of code released https://github.com/microsoft/qlib/pull/227 |