x509: trailing bytes in DER: fix bug

Fix bug in mbedtls_x509_crt_parse that caused trailing extra data in the
buffer after DER certificates to be included in the raw representation. #377
diff --git a/ChangeLog b/ChangeLog
index e9b6790..ed32f0b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -11,6 +11,8 @@
    * Fix issue in Makefile that prevented building using armar. #386
    * Fix memory leak that occured only when ECJPAKE was enabled and ECDHE and
      ECDSA was disabled in config.h . The leak didn't occur by default.
+   * Fix bug in mbedtls_x509_crt_parse that caused trailing extra data in the 
+     buffer after DER certificates to be included in the raw representation.
 
 Changes
    * On ARM platforms, when compiling with -O0 with GCC, Clang or armcc5,