fix #558 (#559)

* Update rss_parsing.py

* Update add_cookies.py

Author: Quan666

src/plugins/ELF_RSS2/command/add_cookies.py

@@ -32,8 +32,8 @@ async def handle_first_receive(matcher: Matcher, args: Message = CommandArg()) -
 
 获取方式：
     PC端 Chrome 浏览器按 F12
-    找到Console选项卡，输入:
-        document.cookie
+    找到 network 选项卡, 
+    找到对应请求点开, 复制请求中完整的 cookie
     输出的字符串就是了\
 """
 

src/plugins/ELF_RSS2/rss_parsing.py

@@ -155,6 +155,8 @@ async def fetch_rss(rss: Rss) -> Tuple[Dict[str, Any], bool]:
     proxy = get_proxy(rss.img_proxy) if URL(rss_url).host not in local_host else None
     cookies = rss.cookies or None
     headers = HEADERS.copy()
+    if cookies:
+        headers["cookie"] = cookies
     d = {}
     cached = False
 
@@ -165,7 +167,6 @@ async def fetch_rss(rss: Rss) -> Tuple[Dict[str, Any], bool]:
             headers["If-Modified-Since"] = rss.last_modified
 
     async with aiohttp.ClientSession(
-        cookies=cookies,  # type: ignore
         headers=headers,
         raise_for_status=True,
         timeout=aiohttp.ClientTimeout(10),