Change STDOUT to dash

Change-Id: I336f5d1559762627785fc6d59f60b7b7d382ac4d
diff --git a/script/conllu2korapxml b/script/conllu2korapxml
index 60d691a..64ba69b 100755
--- a/script/conllu2korapxml
+++ b/script/conllu2korapxml
@@ -50,7 +50,7 @@
 
 my $docid="";
 my $zip = undef;
-my $outh = \*STDOUT;
+my $outh = '-';
 my $parser_file;
 my $parse;
 my $morpho_file;