rst2odt and odf-config-file option

Hello, 

I guess I've found a bug on rst2odt.py 

-- 

I wanted to
apply custom style with rst2odt, and discovered the --odf-config-file
option. 

This option allows to map the default style to a custom one
(so, used in conjunction with --template option). 

But it was not
working on my environment (Debian 9, python3, docutils 1.4) 

-- 

The
__init__ method (l. 888) of the ODFTranslator class initializes a
dictionary : format_map, but it's filled only for python2 

Involved
file:
/usr/lib/python3/dist-packages/docutils/writers/odf_odt/__init__.py 

  
   parser = ConfigParser()
           
parser.read(self.settings.odf_config_file)
            for rststyle,
format in parser.items("Formats"):
                if rststyle not in
self.used_styles:
                    self.document.reporter.warning(
  
                    'Style "%s" is not a style used by odtwriter.' % (

                          rststyle, ))
                if
sys.version_info.major == 2:
                   
self.format_map[rststyle] = format.decode('utf-8')
               # my
addition below 

               else:
                   
self.format_map[rststyle] = format 

---

After applying my update, it
works. (never tested with python2)

Let me know if I can do something
else. 

Regards, 

-- 

Gilles