Bump version to 0.5.0

Change-Id: I080b082f95936c941a8cc782ffee47e07f550b96
diff --git a/script/korapxml2conllu b/script/korapxml2conllu
index e870bf8..5e91c06 100755
--- a/script/korapxml2conllu
+++ b/script/korapxml2conllu
@@ -26,7 +26,7 @@
 
 my $lm_training_data = 0;
 
-our $VERSION = '0.4.1.9000';
+our $VERSION = '0.5.0';
 
 our $VERSION_MSG = "\nkorapxml2conllu - v$VERSION\n";