Merge pull request #1250 from hukkinj1/develop

Remove references to removed isort[pyproject] extra in README

README.md

@@ -98,12 +98,6 @@ Install isort with both formats support:
 pip install isort[requirements,pipfile]
 ```
 
-Install isort with support for reading configuration from `pyproject.toml`:
-
-```bash
-pip install isort[pyproject]
-```
-
 Using isort
 ===========
 
@@ -237,8 +231,7 @@ Or, if you prefer, you can add an `isort` or `tool:isort` section to
 your project's `setup.cfg` or `tox.ini` file with any desired settings.
 
 You can also add your desired settings under a `[tool.isort]` section in
-your `pyproject.toml` file.  For `pyproject.toml` support, use
-`pip install isort[pyproject]`.
+your `pyproject.toml` file.
 
 You can then override any of these settings by using command line
 arguments, or by passing in override values to any of the public Python API