Document the fact that we now use VS 2017 to build the .NET Standard 1.3 flavor of SSH.NET.

README.md

@@ -51,7 +51,7 @@ This project was inspired by **Sharp.SSH** library which was ported from java an
 **SSH.NET** supports the following target frameworks:
 * .NET Framework 3.5
 * .NET Framework 4.0 (and higher)
-* .NET Platform Standard 1.3
+* .NET Standard 1.3
 * Silverlight 4
 * Silverlight 5
 * Windows Phone 7.1
@@ -64,6 +64,7 @@ Software                          | net35 | net40 | netstandard1.3 | sl4 | sl5 |
 --------------------------------- | :---: | :---: | :------------: | :-: | :-: | :--: | :-: | :-----: |
 Windows Phone SDK 8.0             |       |       |                | x   | x   | x    | x   |
 Visual Studio 2012 Update 5       | x     | x     |                | x   | x   | x    | x   |
-Visual Studio 2015 Update 3       | x     | x     | x              |     | x   |      | x   | x
+Visual Studio 2015 Update 3       | x     | x     |                |     | x   |      | x   | x
+Visual Studio 2017                |       | x     | x              |     |     |      |     | 
 
 [![NDepend](http://download-codeplex.sec.s-msft.com/Download?ProjectName=sshnet&DownloadId=629750)](http://ndepend.com)