Rename token_symbol to token_bound

Change-Id: I3e4f35c1fc65b542e948659d94437e818fc1f136
diff --git a/Changes b/Changes
index 5fca5a1..b9359ff 100644
--- a/Changes
+++ b/Changes
@@ -1,3 +1,6 @@
+0.1.6 2022-04-14
+    - Rename TOKEN_SYMBOL to TOKEN_BOUND.
+
 0.1.5 2022-03-28
     - Improve Emoticon-List.