Remove nightly feed from readme

Author: Tratcher

README.md

@@ -14,14 +14,6 @@ To build and run the tests from a command prompt, run `build.cmd` (found in the
 
 See Katana.sln in the root directory to open the solution in Visual Studio.
 
-## Signed Nightly Builds
-If you do not want to build the source, nightly builds are available via a private NuGet feed. Nightly builds are meant for developers to try out new features or bug fixes ahead of an official prerelease or final build. Nightly builds are not supported for production use.
-
-## Nightly build feeds: 
-* Dev (latest) branch: https://dotnet.myget.org/f/katana-dev/
-* Release (stabilization) branch: https://dotnet.myget.org/f/katana-release/
-* IdentityModel dependencies: https://www.myget.org/F/azureadwebstacknightly/
-
 ## Contribute
 There are lots of ways to [contribute](https://github.com/aspnet/Home/blob/master/CONTRIBUTING.md) to the project, and we appreciate our contributors.
 You can contribute by reviewing and sending feedback on code commits, suggesting and trying out new features as they are implemented, submit bugs and help us verify fixes as they are checked in, as well as submit code fixes or code contributions of your own. Note that all code submissions will be rigorously reviewed and tested by the Katana team, and only those that meet an extremely high bar for both quality and design/roadmap appropriateness will be merged into the source.