Remove remnants of bots_unmaintained.

This was deleted in commit 754a9f7
(#567).

Signed-off-by: Anders Kaseorg <anders@zulip.com>

Author: andersk

tools/run-mypy

@@ -20,7 +20,6 @@ exclude = [
     # Excluded because we don't want to require bot authors to
     # fully annotate their bots.
     "zulip_bots/zulip_bots/bots",
-    "zulip_bots/zulip_bots/bots_unmaintained",
 ]
 
 # These files will be included even if excluded by a rule above.

zulip_bots/README.md

@@ -13,7 +13,6 @@ https://chat.zulip.org/api/writing-bots).
 zulip_bots  # This directory
 ├───zulip_bots  # `zulip_bots` package.
 │   ├───bots/  # Actively maintained and tested bots.
-│   ├───bots_unmaintained/  # Unmaintained, potentially broken bots.
 │   ├───game_handler.py  # Handles game-related bots.
 │   ├───lib.py  # Backbone of run.py
 │   ├───provision.py  # Creates a development environment.