Author: Tatiana Malygina <merlettaia@gmail.com>
Last-Update: 2016-07-14
Description: fixes error, which appears when module GO::IO::Dotty is attempted to
 be used: 
 "Can't use a hash as a reference at /usr/share/perl5/GO/IO/Dotty.pm line 104"

--- a/GO/IO/Dotty.pm
+++ b/GO/IO/Dotty.pm
@@ -101,7 +101,7 @@
           $graphviz->add_node
             ( $node, 
               label=>$term->name . " " . $term->acc ,
-              URL=>%opts->{'base_url'}.$term->acc,
+              URL=>%opts{'base_url'}.$term->acc,
               fontname=>'Courier'
             );
       }