Use "#!/usr/bin/env perl" as shebang line.
diff --git a/ChangeLog b/ChangeLog
index 9ee82c6..bed6c9c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -93,6 +93,8 @@
    * 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.
 
 = mbed TLS 2.8.0 branch released 2018-03-16