Update the documentation

README.rst

@@ -23,7 +23,7 @@ split large changes into several smaller changesets.
 Installation
 ------------
 
-git-crecord assumes you have Python 3.6 or later installed as ``/usr/bin/python3``.
+git-crecord assumes you have Python 3.9 or later installed as ``/usr/bin/python3``.
 
 git-crecord ships with a setup.py installer based on setuptools.
 To install git-crecord, simply type::

git-crecord.rst

@@ -40,8 +40,9 @@ OPTIONS
 --author=AUTHOR          Override the commit author. Specify an explicit author using the standard ``A U Thor <author@example.com>`` format.  Otherwise `AUTHOR` is assumed to be a pattern and is used to search for an existing commit by that author (i.e. ``rev-list --all -i --author=AUTHOR``); the commit author is then copied from the first such commit found.
 --date=DATE              Override the author date used in the commit.
 -m MESSAGE, --message=MESSAGE  Use the given `MESSAGE` as the commit message. If multiple ``-m`` options are given, their values are concatenated as separate paragraphs.
--C COMMIT, --reuse-message=COMMIT   Take an existing commit object, and reuse the log message and the authorship information (including the timestamp) when creating the commit.
--c COMMIT, --reedit-message=COMMIT  Like ``-C``, but with ``-c`` the editor is invoked, so that the user can further edit the commit message.
+-C COMMIT, --reuse-message=COMMIT   Reuse the commit message and the authorship information (including the timestamp) of the given commit.
+-c COMMIT, --reedit-message=COMMIT  Like ``-C``, but invoke an editor to allow the user to edit the commit message.
+--fixup COMMIT           Automatically create the commit message by prepending "fixup!" to the commit message of the given commit.
 --reset-author           When used with ``-C``/``-c``/``--amend`` options, or when committing after a conflicting cherry-pick, declare that the authorship of the resulting commit now belongs to the committer. This also renews the author timestamp.
 -s, --signoff            Add ``Signed-off-by`` line by the committer at the end of the commit log message.
 --amend                  Amend previous commit. Replace the tip of the current branch by creating a new commit. The message from the original commit is used as the starting point, instead of an empty message, when no other message is specified from the command line via ``-m`` option. The new commit has the same parents and author as the current one.