Merge pull request #183 from MicrosoftDocs/user/sunilmut/17639_skip

Relese notes for 17639 skip ahead build

Author: sunilmut

WSL/release-notes.md

@@ -12,14 +12,22 @@ ms.assetid: 36ea641e-4d49-4881-84eb-a9ca85b1cdf4
 
 # Release Notes
 
+## Build 17639 (Skip Ahead)
+For general Windows information on build 17639 visit the [Windows Blog](https://blogs.windows.com/windowsexperience/2018/04/04/announcing-windows-10-insider-preview-build-17639-for-skip-ahead/).
+
+### WSL
+* Change default gid and mode of serial devices to match native [GH 3042]
+* DrvFs now supports extended attributes.
+  Note: DrvFs has some limitations on the name of extended attributes. In particular, some characters (like '/', ':' and '\*') are not allowed, and extended attribute names are not case sensitive on DrvFs
+
 ## Build 17133 (Fast)
 For general Windows information on build 17133 visit the [Windows Blog](https://blogs.windows.com/windowsexperience/2018/03/27/announcing-windows-10-insider-preview-build-17133-for-fast/).
 
 ### WSL
 * Fix for hang in WSL. [GH 3039, 3034]
 
 ## Build 17128 (Fast)
-For general Windows information on build 17133 visit the [Windows Blog](https://blogs.windows.com/windowsexperience/2018/03/23/announcing-windows-10-insider-preview-build-17128-for-fast/).
+For general Windows information on build 17128 visit the [Windows Blog](https://blogs.windows.com/windowsexperience/2018/03/23/announcing-windows-10-insider-preview-build-17128-for-fast/).
 
 ### WSL
 * None