Document in which version options were added (#22)

README.rst

@@ -119,6 +119,10 @@ The following `command line arguments`_ can also be used to modify the defaults:
      -l LINE_LENGTH, --line-length LINE_LENGTH
                            How many characters per line to allow [default: 88]
 
+*New in version 1.0.0:* The ``-c``, ``-S`` and ``-l`` command line options.
+
+*New in version 1.0.0:* isort_ is configured with ``-c`` and ``-l``, too.
+
 .. _Black documentation about pyproject.toml: https://black.readthedocs.io/en/stable/pyproject_toml.html
 .. _isort documentation about config files: https://timothycrosley.github.io/isort/docs/configuration/config_files/
 .. _command line arguments: https://black.readthedocs.io/en/stable/installation_and_usage.html#command-line-options