docs: remove deprecated login warning from README

Author: liblaf

LICENSE

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2022-2023 liblaf
+Copyright (c) 2022 liblaf
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

@@ -1,8 +1,5 @@
 # THU Web Learning Downloader
 
-> [!WARNING]
-> username + password 登陆方式已失效, 致使本项目目前不可用 [#223](https://github.com/liblaf/thu-learn-downloader/issues/223). PR Welcome!
-
 Download everything from Web Learning of Tsinghua University
 
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