bpo-39242: Updated the Gmane domain into news.gmane.io (GH-17903)

(cherry picked from commit 2e6a8efa837410327b593dc83c57492253b1201e)

Co-authored-by: Dong-hee Na <donghee.na92@gmail.com>
diff --git a/Lib/nntplib.py b/Lib/nntplib.py
index 1b7e83a..9036f36 100644
--- a/Lib/nntplib.py
+++ b/Lib/nntplib.py
@@ -1107,7 +1107,7 @@
         nntplib built-in demo - display the latest articles in a newsgroup""")
     parser.add_argument('-g', '--group', default='gmane.comp.python.general',
                         help='group to fetch messages from (default: %(default)s)')
-    parser.add_argument('-s', '--server', default='news.gmane.org',
+    parser.add_argument('-s', '--server', default='news.gmane.io',
                         help='NNTP server hostname (default: %(default)s)')
     parser.add_argument('-p', '--port', default=-1, type=int,
                         help='NNTP port number (default: %s / %s)' % (NNTP_PORT, NNTP_SSL_PORT))