Nothing special, you just fork the project, and send me a pull request.
Don't forget to add tests for that change.
An important note: if you want to add a line in the tests which makes a new HTTP request,
you'll have to get your own API key and access token. You can get the
API key and secret here
(assuming you already have a Flickr account), and you can then obtain an access token by using my
authentication system (described above). You then have to assign these
values to the environment variables FLICKR_API_KEY, FLICKR_SHARED_SECRET,
FLICKR_ACCESS_TOKEN and FLICKR_ACCESS_SECRET. That's it, you should
be able to run the tests normally now.