v1.0.0  2013-07-15
        First release.
v1.0.1  2013-12-09
        Fixed some tests to work in cases where dogstatsd is not available.
v1.0.2  2013-12-12
        Updated to be backwards compatible with Perl v5.8.x.
v1.0.3  2015-03-21
        Updated 'negative sample rate' tests. Increased test coverage.
        Cleaned up documentation.