fix: update a url.

Author: CptGit

_includes/license.html

@@ -1,7 +1,7 @@
 {%- case page.lang -%}
   {%- when 'zh-cn' -%}
   <p><strong>版权声明</strong>：</p>
-  <p><a rel="license" href="https://creativecommons.org/licenses/by-nc-sa/4.0/"><img alt="知识共享许可协议" style="border-width:0" src="https://i.creativecommons.org/l/by-nc-sa/4.0/88x31.png" /></a><br />本作品采用<a rel="license" href="https://creativecommons.org/licenses/by-nc-sa/4.0/deed.zh">知识共享署名-非商业性使用-相同方式共享 4.0 国际许可协议</a>进行许可。</p>
+  <p><a rel="license" href="https://creativecommons.org/licenses/by-nc-sa/4.0/"><img alt="知识共享许可协议" style="border-width:0" src="https://i.creativecommons.org/l/by-nc-sa/4.0/88x31.png" /></a><br />本作品采用<a rel="license" href="https://creativecommons.org/licenses/by-nc-sa/4.0/deed.zh-hans">知识共享署名-非商业性使用-相同方式共享 4.0 国际许可协议</a>进行许可。</p>
   {%- when 'en' -%}
   <p><strong>LICENSE</strong>:</p>
   <p><a rel="license" href="https://creativecommons.org/licenses/by-nc-sa/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by-nc-sa/4.0/88x31.png" /></a><br />This work is licensed under a <a rel="license" href="https://creativecommons.org/licenses/by-nc-sa/4.0/">Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License</a>.</p>