Declare a versioned dependcy on WebService::MusicBrainz

Make sure that users get an appropriate error message if they have a
version that's not new enough.

diff --git a/abcde-musicbrainz-tool b/abcde-musicbrainz-tool
index 86b10e2..27efcef 100755 (executable)
--- a/abcde-musicbrainz-tool
+++ b/abcde-musicbrainz-tool
@@ -16,7 +16,7 @@ use utf8;
 use POSIX qw(ceil);
 use Digest::SHA;
 use MusicBrainz::DiscID;
-use WebService::MusicBrainz;
+use WebService::MusicBrainz 1.0.4;
 use Getopt::Long;
 use Pod::Usage;