update doc and changelog

Author: vlm

ChangeLog

@@ -8,7 +8,10 @@
     * Added SAE J2735 example.
 
     NOTABLE:
-    * converter-sample.c renamed into converter-example.c.
+    * Converter example (included by default):
+      * converter-sample.c renamed into converter-example.c
+      * make converter-example.mk file for building that converter
+      * asn1c -no-gen-example to stop generating converter-example.{c,mk}
     * asn1c -no-gen-example option to disable converter-example generation.
     * Added random value generation (-R option to converter-example).
     * Added LibFuzzer-based randomized tests for supported transfer syntaxes