Generate Xcode project does not work

[arpaplus]

Hello! I have an old project which includes Antlr4 project and framework (Swift-3 deprecated). I need to update it.

https://github.com/antlr/antlr4/blob/master/doc/swift-target.md says:
$ cd antlr4/runtime/Swift
$ python boot.py --gen-xcodeproj

But these commands won't generate Xcode project, since this is deprecated function of Xcode, doesn't work anymore.
Do you know any workaround ?