Fix #669: Drop support for VS2017, as it seems to no longer work

Author: tom-englert

README.md

@@ -35,7 +35,7 @@ This project is supported by the [.NET Foundation](https://dotnetfoundation.org)
 Can be found in the [Documentation folder](Documentation/Readme.md).
 
 ## Installation
-ResXResourceManager is available as VS2017-2022 extension and as a standalone executable to support VS2015 and older or users without Visual Studio at all.
+ResXResourceManager is available as VS2019-2022 extension and as a standalone executable to support VS2017 and older or users without Visual Studio at all.
 A scripting module is available as well, so you can easily automate resource tasks, e.g. export untranslated string during build.
 
 All versions can be downloaded from the [releases](../../releases) page.

src/ResXManager.VSIX/source.extension.vsixmanifest

@@ -13,7 +13,7 @@
     <Tags>WPF, WinForms, resx, resources, Editor, localization, Productivity, Visual Studio, internationalization, string, resource, l10n, i18n</Tags>
   </Metadata>
   <Installation InstalledByMsi="false">
-    <InstallationTarget Version="[15.0,17.0)" Id="Microsoft.VisualStudio.Community">
+    <InstallationTarget Version="[16.0,17.0)" Id="Microsoft.VisualStudio.Community">
       <ProductArchitecture>x86</ProductArchitecture>
     </InstallationTarget>
     <InstallationTarget Version="[17.0,18.0)" Id="Microsoft.VisualStudio.Community">