There is an ongoing outage on the primary CPAN mirror. It is possible to work around the issue by using MetaCPAN as a mirror.

Revision history for App-GitHooks-Plugin-PreventTrailingWhitespace

v1.0.1  2014-06-09
        - Required git v1.7.4.1

v1.0.0  2014-06-04
        - Public release.