fix require name (#159)

* fix require name
* require before import

src/plugins/nonebot_bison/__init__.py

@@ -1,5 +1,7 @@
 from nonebot.plugin import require
 
+require("nonebot_plugin_datastore")
+
 from . import (
     admin_page,
     bootstrap,
@@ -14,8 +16,6 @@ from . import (
 )
 from .plugin_config import plugin_config
 
-require("nonebot_plugin_localstore")
-
 __help__version__ = "0.4.3"
 __help__plugin__name__ = "nonebot_bison"
 __usage__ = f"本bot可以提供b站、微博等社交媒体的消息订阅，详情请查看本bot文档，或者{'at本bot' if plugin_config.bison_to_me else '' }发送“添加订阅”订阅第一个帐号，发送“查询订阅”或“删除订阅”管理订阅"