perf(client): improve request send performance (#455)

Author: 0x676e67

python/rnet/__init__.pyi

@@ -60,7 +60,6 @@ class StatusCode:
     HTTP status code.
     """
 
-    def __str__(self) -> str: ...
     def as_int(self) -> int:
         r"""
         Return the status code as an integer.
@@ -97,6 +96,8 @@ class StatusCode:
         """
         ...
 
+    def __str__(self) -> str: ...
+
 @final
 class SocketAddr:
     r"""