Update README.md

Author: zspitz

README.md

@@ -4,7 +4,7 @@ This project provides the following:
 
 * [![NuGet Status](https://img.shields.io/nuget/v/ExpressionTreeToString.svg?style=flat&max-age=86400)](https://www.nuget.org/packages/ExpressionTreeToString/) Extension methods to [create a C# or VB.NET code-like string representation](https://github.com/zspitz/ExpressionToString#string-representations-of-expression-trees), of expression trees or expression tree parts (.NET Standard library)
 * [![GitHub Release](https://img.shields.io/github/release/zspitz/expressiontostring.svg?style=flat&max-age=86400)](https://github.com/zspitz/ExpressionToString/releases) A [debugging visualizer for expression trees / expression tree parts](https://github.com/zspitz/ExpressionToString#visual-studio-debugger-visualizer-for-expression-trees)  
-  **Installation:** The visualizer DLL and the dependent DLL (`MultiSelectTreeView.DLL`), on the [release page](https://github.com/zspitz/ExpressionToString/releases), should be placed in the appropriate folder, as described [here](https://docs.microsoft.com/en-us/visualstudio/debugger/how-to-install-a-visualizer?view=vs-2017). It may be necessary to unblock the DLLs.
+  **Installation:** The visualizer DLL (2019 or 2017, depending on your VS version) and the dependent DLL (`MultiSelectTreeView.DLL`), from the [releases page](https://github.com/zspitz/ExpressionToString/releases), should be placed in the appropriate folder, as described [here](https://docs.microsoft.com/en-us/visualstudio/debugger/how-to-install-a-visualizer?view=vs-2017). It may be necessary to unblock the DLLs.
 
 ### Feedback