Add entry in ChangeLog
Add an entry in the ChangeLog, describing the fix.
mbed TLS ChangeLog (Sorted per branch, date)
+= mbed TLS x.x.x branch released xxxx-xx-xx
+
+Bugfix
+ * Add ecc extensions only if an ecc based ciphersuite is used.
+ Affects interoperability with BouncyCastle and other peers.
+ Raised by milenamil in #1157.
+
= mbed TLS 2.11.0 branch released 2018-06-18
Features
