Added link to YAML::Tiny

README.md

 ### pl2yml.pl, yml2pl.pl ###
 
 Simple scripts to read YAML/Perl data structure from a file and dump it in
-the other format to STDIN.  Uses YAML::Tiny for YAML jobs.
+the other format to STDIN.  Uses [YAML::Tiny][2] for YAML jobs.
 
+  [2]: https://metacpan.org/module/YAML::Tiny
 
 
 cgi-bin - CGI scripts