Add changelog for mbedtls_ecdsa_sign fix
@@ -17,6 +17,8 @@ Bugfix
* Fix leap year calculation in x509_date_is_valid() to ensure that invalid
dates on leap years with 100 and 400 intervals are handled correctly. Found
by Nicholas Wilson. #694
+ * Add a check for invalid private parameters in mbedtls_ecdsa_sign.
+ Reported by Yolan Romailler.
= mbed TLS 2.6.0 branch released 2017-08-10
