Update ChangeLog

ChangeLog

@@ -13,6 +13,8 @@ improvements have been made in order to support libsodium.js
 implementation of randombytes_uniform() any more. randombytes_stir()
 and randombytes_close() can also be NULL pointers if they are not
 required.
+ - On Linux, getrandom(2) is being used instead of directly accessing
+/dev/urandom, if the kernel supports this system call.
 
 * Version 1.0.2
  - The _easy and _detached APIs now support precalculated keys;