Update README.md

Author: niemyjski

README.md

@@ -10,7 +10,7 @@ DateTimeRange, Business Day and various DateTime, DateTimeOffset, TimeSpan exten
 
 [This package](https://www.nuget.org/packages/Exceptionless.DateTimeExtensions/) can be installed via the [NuGet package manager](https://docs.nuget.org/consume/Package-Manager-Dialog). If you need help, please contact us via in-app support or [open an issue](https://github.com/exceptionless/Exceptionless.DateTimeExtensions/issues/new). We’re always here to help if you have any questions!
 
-1. You will need to have [Visual Studio 2013](http://www.visualstudio.com/products/visual-studio-community-vs) installed.
+1. You will need to have [Visual Studio 2017](http://www.visualstudio.com/products/visual-studio-community-vs) installed.
 2. Open the `Exceptionless.DateTimeExtensions.sln` Visual Studio solution file.
 
 ## Using DateTimeExtensions