Fix sigle-pattern option to take effect on the whole sigle

Resolves #4

Change-Id: I3514dead562acfccd6ee21c7d1f9e36af5e2fbba
diff --git a/Changes b/Changes
index 7116bf3..77350ea 100644
--- a/Changes
+++ b/Changes
@@ -1,4 +1,5 @@
         - korapxml2conllu:
+            - the sigle-pattern option now affects the entire sigle
             - handle docid attributes correctly if they are in a different line than their parent element <layer>
 
 0.5.0 2022-09-29