Also mask cmd line option to not show for python 3

sc2reader/scripts/sc2json.py

@@ -16,28 +16,30 @@ def main():
         default=None,
         help="The per-line indent to use when printing a human readable json string",
     )
-    parser.add_argument(
-        "--encoding",
-        "-e",
-        type=str,
-        default="UTF-8",
-        help="The character encoding use..",
-    )
     parser.add_argument(
         "path",
         metavar="path",
         type=str,
         nargs=1,
         help="Path to the replay to serialize.",
     )
+    if sys.version_info.major < 3:
+        parser.add_argument(
+            "--encoding",
+            "-e",
+            type=str,
+            default="UTF-8",
+            help="The character encoding use..",
+        )
+
     args = parser.parse_args()
 
     factory = sc2reader.factories.SC2Factory()
 
     if sys.version_info.major < 3:
         factory.register_plugin(
             "Replay", toJSON(encoding=args.encoding, indent=args.indent)
-        )  # legacy Python
+        )
     else:
         factory.register_plugin("Replay", toJSON(indent=args.indent))
     replay_json = factory.load_replay(args.path[0])