Backport 2.1: Use "#!/usr/bin/env perl" as shebang line.
diff --git a/ChangeLog b/ChangeLog
index 0c247f9..704ecc9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -51,6 +51,8 @@
    * Improve robustness of mbedtls_ssl_derive_keys against the use of
      HMAC functions with non-HMAC ciphersuites. Independently contributed
      by Jiayuan Chen in #1377. Fixes #1437.
+   * Change the shebang line in Perl scripts to look up perl in the PATH.
+     Contributed by fbrosson in #1533.
 
 = mbed TLS 2.1.11 branch released 2018-03-16