Add demo server plugin

Change-Id: Ic2fbe8920397aeab176aba57b22d061f6697ff32
diff --git a/Changes b/Changes
index f521e17..4b16d51 100755
--- a/Changes
+++ b/Changes
@@ -35,6 +35,7 @@
         - Fix blind header titles.
         - Turn "upgradeTo" into an object prototype.
         - Fix QueryParam response to work with Chrome (#149).
+        - Added DemoServer plugin.
 
 0.42 2021-06-18
         - Added GitHub based CI for perl.