Update docs

doc/changelog.asciidoc

@@ -43,6 +43,7 @@ Added
 - New `delete` target for `:hint` which removes the hinted element from
   the DOM.
 - Support for notifications (shown via system tray) with Qt 5.13.
+- New `--config-py` commandline argument to use a custom `config.py` file.
 
 Changed
 ~~~~~~~

doc/qutebrowser.1.asciidoc

@@ -41,6 +41,9 @@ show it.
 *-B* 'BASEDIR', *--basedir* 'BASEDIR'::
     Base directory for all storage.
 
+*-C* 'CONFIG', *--config-py* 'CONFIG'::
+    Path to config.py.
+
 *-V*, *--version*::
     Show version and quit.
 

qutebrowser/qutebrowser.py

@@ -62,7 +62,8 @@ def get_argparser():
                                      description=qutebrowser.__description__)
     parser.add_argument('-B', '--basedir', help="Base directory for all "
                         "storage.")
-    parser.add_argument('-C', '--config-py', help="Path to config.py.")
+    parser.add_argument('-C', '--config-py', help="Path to config.py.",
+                        metavar='CONFIG')
     parser.add_argument('-V', '--version', help="Show version and quit.",
                         action='store_true')
     parser.add_argument('-s', '--set', help="Set a temporary setting for "