Bump version to 0.5.0

Change-Id: I080b082f95936c941a8cc782ffee47e07f550b96
diff --git a/script/conllu2korapxml b/script/conllu2korapxml
index 33e042c..15e396c 100755
--- a/script/conllu2korapxml
+++ b/script/conllu2korapxml
@@ -14,7 +14,7 @@
 my %opts;
 my %processedFilenames;
 
-our $VERSION = '0.4.1.9000';
+our $VERSION = '0.5.0';
 our $VERSION_MSG = "\nconllu2korapxml - v$VERSION\n";
 
 use constant {