sendme: Add changes file for prop289

Signed-off-by: David Goulet <dgoulet@torproject.org>

diff --git a/changes/ticket26288 b/changes/ticket26288
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+  o Major features (flow control):
+    - Implement authenticated SENDMEs detailed in proposal 289. A SENDME cell
+      now includes the digest of the last cell received so once the end point
+      receives the SENDME, it can confirm the other side's knowledge of the
+      previous cells that were sent. This behavior is controlled by two new
+      consensus parameters, see proposal for more details. Fixes ticket 26288.