fix wrong pandas version in docstring

Author: anmyachev

pandas/io/parsers.py

@@ -240,7 +240,7 @@
     conversion. May produce significant speed-up when parsing duplicate
     date strings, especially ones with timezone offsets.
 
-    .. versionadded:: 0.23.0
+    .. versionadded:: 0.25.0
 iterator : bool, default False
     Return TextFileReader object for iteration or getting chunks with
     ``get_chunk()``.