Point to a more up to date isort plugin in README (#483)

Author: doolio

Diff for: README.md

@@ -82,7 +82,7 @@ apk add py3-lsp-server
 Installing these plugins will add extra functionality to the language server:
 
 - [pylsp-mypy](https://github.com/Richardk2n/pylsp-mypy): [MyPy](http://mypy-lang.org/) type checking for Python >=3.8.
-- [pyls-isort](https://github.com/paradoxxxzero/pyls-isort): code formatting using [isort](https://github.com/PyCQA/isort) (automatic import sorting).
+- [pyls-isort](https://github.com/chantera/python-lsp-isort): code formatting using [isort](https://github.com/PyCQA/isort) (automatic import sorting).
 - [python-lsp-black](https://github.com/python-lsp/python-lsp-black): code formatting using [Black](https://github.com/psf/black).
 - [pyls-memestra](https://github.com/QuantStack/pyls-memestra): detecting the use of deprecated APIs.
 - [pylsp-rope](https://github.com/python-rope/pylsp-rope): Extended refactoring capabilities using [Rope](https://github.com/python-rope/rope).