fix(windows): specify required powershell version for the installation script (#2376)

README.md

@@ -41,7 +41,9 @@ To run the install script without any interaction you can pass the `-y` flag to
 
 The same way, you can use `--no-install-dependencies` to skip the dependency installation.
 
-### Windows (Powershell):
+### Windows (Powershell 7+):
+
+Powershell v7+ is required for this script. For instructions on how to install, [click here.](https://docs.microsoft.com/en-us/powershell/scripting/install/installing-powershell?view=powershell-7.2)
 
 ```powershell
 Invoke-WebRequest https://raw.githubusercontent.com/LunarVim/LunarVim/master/utils/installer/install.ps1 -UseBasicParsing | Invoke-Expression