Bug #1597576: mention that the new base64 api has been introduced in py2.4.  (backport from rev. 52762)
Bug #1597576: mention that the new base64 api has been introduced in py2.4.
 (backport from rev. 52762)

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator