fix: ntfy encoding error when sending non-Latin characters

Author: LeslieLeung

heimdallr/channel/ntfy.py

@@ -18,9 +18,9 @@ def __init__(self, title: str, body: str, **kwargs):
 
     def render_message(
         self,
-    ) -> Tuple[Dict, str]:
-        headers: Dict = {"Title": self.title}
-        content = self.body
+    ) -> Tuple[Dict, bytes]:
+        headers: Dict = {"Title": self.title.encode(encoding="utf-8")}
+        content = self.body.encode(encoding="utf-8")
         if self.msg_type == "markdown":
             headers["Content-Type"] = "text/markdown"