docs: add subcommand  to docs
@@ -12,7 +12,7 @@ with other functionalities available as subcommands
.. code:: bash
- treetime {ancestral, clock, homoplasy, mugration, version}
+ treetime {ancestral, clock, homoplasy, mugration, arg, version}
TreeTime can use full alignments in `fasta` or `phylip` format or work of VCF files.
