Introducing explicit type for implicit digest component

Change-Id: Ib2cd9a986a6b8835b0217c10aba62dbb30fc8bbc
Refs: #2011
diff --git a/changelog.rst b/changelog.rst
index 07d67db..1101493 100644
--- a/changelog.rst
+++ b/changelog.rst
@@ -7,6 +7,7 @@
 - **Name**
 
   + Allow zero-length name component
+  + Require implicit digest to be specified using ``ImplicitSha256Digest`` name component
 
 Since version 0.1
 -----------------