Actually ignore most non-fatal alerts

fixes #308
diff --git a/ChangeLog b/ChangeLog
index 3ca9268..1c132ab 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,11 @@
 mbed TLS ChangeLog (Sorted per branch, date)
 
+= mbed TLS 1.3.15 released 2015-10-xx
+
+Bugfix
+   * Fix bug causing some handshakes to fail due to some non-fatal alerts not
+     begin properly ignored. Found by mancha and Kasom Koht-arsa, #308
+
 = mbed TLS 1.3.14 released 2015-10-06
 
 Security