add note that cabal v2-run is not supported on windows

Author: samuelpilz

README.md

@@ -209,6 +209,8 @@ The install-script can be invoked via `cabal` instead of `stack` with the comman
 cabal v2-run ./install.hs --project-file install/shake.project <target>
 ```
 
+Running the script with cabal on windows seems to have some issues and is currently not fully supported.
+
 Unfortunately, it is still required to have `stack` installed so that the install-script can locate the `local-bin` directory (on Linux `~/.local/bin`) and copy the `hie` binaries to `hie-x.y.z`, which is required for the `hie-wrapper` to function as expected.
 
 For brevity, only the `stack`-based commands are presented in the following sections.