Add Changelog entry for #482

Add Changelog entry for inline assembly/literal strings too long issue with
Clang.
diff --git a/ChangeLog b/ChangeLog
index 8c82d08..b446d63 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -3,10 +3,13 @@
 = mbed TLS x.x.x branch released xxxx-xx-xx
 
 Bugfix
-    * Fix failure in hmac_drbg in the benchmark sample application, when
-      MBEDTLS_THREADING_C is defined. Found by TrinityTonic, #1095
-    * Fix a bug in the update function for SSL ticket keys which previously
-      invalidated keys of a lifetime of less than a 1s. Fixes #1968.
+   * Fix failure in hmac_drbg in the benchmark sample application, when
+     MBEDTLS_THREADING_C is defined. Found by TrinityTonic, #1095
+   * Fix a bug in the update function for SSL ticket keys which previously
+     invalidated keys of a lifetime of less than a 1s. Fixes #1968.
+   * Fix for Clang, which was reporting a warning for the bignum.c inline
+     assembly for AMD64 targets creating string literals greater than those
+     permitted by the ISO C99 standard. Found by Aaron Jones. Fixes #482.
 
 Changes
    * Add tests for session resumption in DTLS.