Update library version number to 2.1.17
diff --git a/ChangeLog b/ChangeLog
index ea69e86..f4bc969 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,6 +1,6 @@
 mbed TLS ChangeLog (Sorted per branch, date)
 
-= mbed TLS 2.1.x branch released xxxx-xx-xx
+= mbed TLS 2.1.17 branch released 2018-11-30
 
 Security
    * Fix timing variations and memory access variations in RSA PKCS#1 v1.5