Update WG list for new Release working group (onnx#2826)

And move Data Pipelines to inactive due to no recent activity

Co-authored-by: Ke Zhang <kezhan@microsoft.com>

community/working-groups.md

@@ -14,8 +14,8 @@ You can find the schedule of meetings on the [LF AI wiki](https://wiki.lfai.foun
 
 | Working Group      | Objectives    |
 | ------------------ | ------------- |
+| [Release](https://gitter.im/onnx/Releases) | Improve the release process for ONNX |
 | [Training](https://gitter.im/onnx/training) | Expand ONNX to support training as well as inference |
-| [Data Pipelines](https://gitter.im/onnx/pipelines) | Define new operators for processing the data that goes in and comes out |
 
 ## Completed working groups
 
@@ -31,3 +31,4 @@ You can find the schedule of meetings on the [LF AI wiki](https://wiki.lfai.foun
 | ------------------ | ------------- | ------ |
 | [Testing/Compliance](https://gitter.im/onnx/test_compliance) | Create tools, tests and APIs to ensure models and backends comply with the ONNX specification | became part of the ArchInfra SIG for now |
 | [Edge/Mobile](https://gitter.im/onnx/edge) | Enable deployment of ONNX models to edge platforms by identifying the ONNX operators that must be supported by mobile and IoT runtimes, defining tool chain requirements, and contributing to ONNX compatibility tests | Stopped as of January 2020 |
+| [Data Pipelines](https://gitter.im/onnx/pipelines) | Define new operators for processing the data that goes in and comes out | No recent activity |