Update MDS-WG mailing list link

Remove reference to MDS-Announce

Signed-off-by: Mitch Vars <mplsmitch@gmail.com>

Author: mplsmitch

README.md

@@ -136,7 +136,7 @@ Starting with MDS 2.0, OpenAPI documents describe MDS endpoints and allow for [s
 
 # Get Involved
 
-To stay up to date on MDS, please **subscribe to the [mds-announce](https://groups.google.com/a/groups.openmobilityfoundation.org/g/mds-announce) mailing list** for general updates, the **[wg-mds](https://groups.google.com/a/groups.openmobilityfoundation.org/g/wg-mds) mailing list** for Working Group details and meetings, and read our **[Community Wiki](https://github.com/openmobilityfoundation/mobility-data-specification/wiki)**.
+To stay up to date on MDS, please **subscribe the [wg-mds](https://groups.google.com/a/groups.openmobilityfoundation.org/g/wg-mds) mailing list** for general updates, Working Group details and meetings, and read our **[Community Wiki](https://github.com/openmobilityfoundation/mobility-data-specification/wiki)**.
 
 The Mobility Data Specification is an open source project with all development taking place on GitHub and public meetings through our [MDS Working Group](https://github.com/openmobilityfoundation/mobility-data-specification/wiki/MDS-Working-Group). Comments and ideas can be shared by [starting a discussion](https://github.com/openmobilityfoundation/mobility-data-specification/discussions), [creating an issue](https://github.com/openmobilityfoundation/mobility-data-specification/issues), suggesting changes with [a pull request](https://github.com/openmobilityfoundation/mobility-data-specification/pulls), and attending meetings. Before contributing, please review our OMF [CONTRIBUTING](https://github.com/openmobilityfoundation/governance/blob/main/CONTRIBUTING.md) and [CODE OF CONDUCT](https://github.com/openmobilityfoundation/governance/blob/main/CODE_OF_CONDUCT.md) pages to understand guidelines and policies for participation.