c2k: include lemma only if !='_' (unless token is also '_')

Change-Id: Id1fd52a61177d47286bad858a561ccdc7c2df64e
diff --git a/Changes b/Changes
index b250585..be573b3 100644
--- a/Changes
+++ b/Changes
@@ -1,5 +1,6 @@
         - korapxml2conllu: use morpho.xml if present when run on base zips
         - korapxml2conllu: new option -c <columns>
+        - conllu2korapxml: ignore _-lemmas
 
 0.4.1 2021-07-31
         - korapxml2conllu: fix patterns not extracted for last texts in archive