Better handling of non-string message texts

Now everything will be allowed and automatically casted to string. This
means that send_message(id, True) would send "True", literally.

pyrogram/client/parser/parser.py

@@ -31,7 +31,7 @@ class Parser:
         self.markdown = Markdown(client)
 
     def parse(self, text: str, mode: Union[str, None] = object):
-        text = str(text or "").strip()
+        text = str(text).strip()
 
         if mode == object:
             if self.client: