add fileinput.filelineno and fileinput.fileno (#1338)

stdlib/2and3/fileinput.pyi

@@ -22,6 +22,8 @@ def close() -> None: ...
 def nextfile() -> None: ...
 def filename() -> str: ...
 def lineno() -> int: ...
+def filelineno() -> int: ...
+def fileno() -> int: ...
 def isfirstline() -> bool: ...
 def isstdin() -> bool: ...