Update API version to 60.

modules/Bio/EnsEMBL/ApiVersion.pm

@@ -46,7 +46,7 @@ use base qw( Exporter );
 
 our @EXPORT = qw( software_version );
 
-my $API_VERSION = 59;
+my $API_VERSION = 60;
 
 sub software_version { return $API_VERSION }