Added test for sigles support in extract

Change-Id: I5f5596a88da6314f0d1f7e8299fef7425f89a52f
diff --git a/Changes b/Changes
index 499883c..401602e 100644
--- a/Changes
+++ b/Changes
@@ -12,6 +12,7 @@
         - Fixed setting multiple annotations in
           script.
         - Fixed output of version and help messages.
+        - Added extraction test.
 
 0.17 2016-03-22
         - Rewrite siglen to use slashes as separators.