Update CONTRIBUTING.md doc

CONTRIBUTING.md

@@ -10,47 +10,20 @@ with any additional questions or comments.
 
 ## Building
 
-### Prerequisites required
+### Prerequisites:
 
-* [Microsoft Build Tools 2015](https://www.microsoft.com/en-us/download/details.aspx?id=48159) (automatically installed with Visual Studio 2015)
+* [Visual Studio 2017](https://www.visualstudio.com/en-us)
 
-### Better with
-
-* [Visual Studio 2015](https://www.visualstudio.com/en-us)
-* [NuProj](http://nuproj.net) extension for Visual Studio
-
-### Important notice when developing with Visual Studio
-
-The NuGet package restore functionality in Visual Studio does not work for this project, which relies
-on newer functionality than comes with Visual Studio 2015 Update 3. You should disable automatic
-package restore on build in Visual Studio in order to build successfully and have a useful Error List
-while developing.
-
-Follow these steps to disable automatic package restore in Visual Studio:
-
-1. Tools -> Options -> NuGet Package Manager -> General
-2. *Clear* the checkbox for "Automatically check for missing packages during build in Visual Studio
-
-With this setting, you can still execute a package restore within Visual Studio by right-clicking
-on the _solution_ node in Solution Explorer and clicking "Restore NuGet Packages". But do not ever
-execute that on this project as that will corrupt the result of `init.ps1`.
-
-## Build steps
+### Build steps
 
 This project can be built with the follow commands from a Visual Studio Developer Command Prompt,
 assuming the working directory is the root of this repository:
 
 ```
-.\init
-cd src
-msbuild
+msbuild /restore src
 ```
 
-After making project or project.json change, or to recover after Visual Studio executes a package restore,
-you may need to repeat the init command listed above to re-execute package restore.
-
-This solution can also be built from within Visual Studio 2015, although building the NuGet package
-from within Visual Studio requires the NuProj extension as described above.
+This solution can also be built from within Visual Studio 2017.
 
 ## Pull requests