fix some types in poplib (#1225)

Fixes a problem introduced in #1211.

Author: JelleZijlstra

stdlib/2and3/poplib.pyi

@@ -6,6 +6,8 @@ import ssl
 import sys
 from typing import Any, BinaryIO, Dict, List, Optional, Pattern, Text, Tuple
 
+_LongResp = Tuple[bytes, List[bytes], int]
+
 class error_proto(Exception): pass
 
 POP3_PORT: int
@@ -31,9 +33,9 @@ class POP3:
     def user(self, user: Text) -> bytes: ...
     def pass_(self, pswd: Text) -> bytes: ...
     def stat(self) -> Tuple[int, int]: ...
-    def list(self, which: Optional[Text] = ...) -> bytes: ...
-    def retr(self, which: Text) -> bytes: ...
-    def dele(self, which: Text) -> bytes: ...
+    def list(self, which: Optional[Any] = ...) -> _LongResp: ...
+    def retr(self, which: Any) -> _LongResp: ...
+    def dele(self, which: Any) -> bytes: ...
     def noop(self) -> bytes: ...
     def rset(self) -> bytes: ...
     def quit(self) -> bytes: ...
@@ -46,8 +48,8 @@ class POP3:
         def apop(self, user: Text, secret: Text) -> bytes: ...
     else:
         def apop(self, user: Text, password: Text) -> bytes: ...
-    def top(self, which: Text, howmuch: int) -> bytes: ...
-    def uidl(self, which: Optional[Text] = ...) -> bytes: ...
+    def top(self, which: Any, howmuch: int) -> _LongResp: ...
+    def uidl(self, which: Optional[Any] = ...) -> _LongResp: ...
     if sys.version_info >= (3, 5):
         def utf8(self) -> bytes: ...
     if sys.version_info >= (3, 4):