Adapt ChangeLog
diff --git a/ChangeLog b/ChangeLog
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@@ -1,5 +1,12 @@
 mbed TLS ChangeLog (Sorted per branch, date)
 
+= mbed TLS x.x.xx branch released xxxx-xx-xx
+
+Bugfix
+   * Fix out-of-memory problem when parsing 4096-bit PKCS8-encrypted RSA keys.
+     Found independently by Florian in the mbed TLS forum and by Mishamax.
+     #878, #1019.
+
 = mbed TLS 1.3.21 branch released 2017-08-10
 
 Security