[core] Change OptionParser to ArgumentParser

COPYING

@@ -1,6 +1,7 @@
 Copyright (C) 2020 by Thomas Lindner <tom@dl6tom.de>
 Copyright (C) 2020 by Cathy Hu <cathy.hu@fau.de>
 Copyright (C) 2020 by Christian <c.hagenest@pm.me>
+Copyright (C) 2020 by Martin Rey <martin.rey@mailbox.org>
 
 Permission to use, copy, modify, and/or distribute this software for any purpose
 with or without fee is hereby granted.

kibicara/config.py

@@ -1,9 +1,10 @@
 # Copyright (C) 2020 by Thomas Lindner <tom@dl6tom.de>
 # Copyright (C) 2020 by Cathy Hu <cathy.hu@fau.de>
+# Copyright (C) 2020 by Martin Rey <martin.rey@mailbox.org>
 #
 # SPDX-License-Identifier: 0BSD
 
-from optparse import OptionParser
+from argparse import ArgumentParser
 from pytoml import load
 
 
@@ -13,12 +14,18 @@ config = {
     'root_url': 'http://localhost:8000/',
 }
 
-parser = OptionParser()
-parser.add_option('-f', dest='configfile', default='/etc/kibicara.conf')
-(option, args) = parser.parse_args()
+parser = ArgumentParser()
+parser.add_argument(
+    '-f',
+    '--config',
+    dest='configfile',
+    default='/etc/kibicara.conf',
+    help='path to config file',
+)
+args = parser.parse_args()
 
 try:
-    with open(option.configfile) as configfile:
+    with open(args.configfile) as configfile:
         config.update(load(configfile))
 except FileNotFoundError:
     # run with default config