Update release_notes.md

commandline/WSL/release_notes.md

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 # Release Notes
 
+## Build 15042
+
+For general Windows information on build 16170 visit the [Windows Blog](https://blogs.windows.com/windowsexperience/2017/04/07/announcing-windows-10-insider-preview-build-16170-pc/).<br/>
+To track or report an issue visit our [Github page](https://github.com/Microsoft/BashOnWindows/issues). <br/>
+
+### Fixed
+
+- Support socket option IP_ADD_MEMBERSHIP & IPV6_ADD_MEMBERSHIP [GH 1678]
+- Add support for PTRACE_OLDSETOPTIONS. [GH 1692] 
+- Additional fixes and improvements 
+
+### LTP Results
+No changes since 15042
+
+</br>
+
+
+
+
 ## Build 15046 to Windows 10 Creators Update
 There are no more WSL fixes or features planned for inclusion in the Creators Update to Windows 10. Release notes for WSL will resume in the coming weeks for additions targeting the next major Windows Update. For general Windows information on build 15046 and future Insider releases visit the [Windows Blog](https://blogs.windows.com/windowsexperience/2017/02/28/announcing-windows-10-insider-preview-build-15046-pc/). <br/><br/>
 To track or report an issue visit our [Github page](https://github.com/Microsoft/BashOnWindows/issues). <br/><br/>