0.04    2013-03-19
        - Changed default cache expiration to 3 minutes.
        - SHA-encode URLs (for cache keys).
            - Added Digest::SHA 5.84 as requirement.

0.03    2013-03-19
        - Removed unnecessary output to STDERR.

0.02    2013-03-19
        - Added caching of URL requests.

0.01    2013-03-19
        - Initial release.