Added some missing dates to Changes file

Hi Yanick,

I've added some missing dates to your Changes file, to make your file CPAN::Changes::Spec compliant.

A couple of notes:

 * I could find evidence of release 0.41.1 on backpan, so have put the date as 'unknown'. Maybe it was never released, in which case you could change `unknown` to `not released`, or just merge the bullets into the next release.
 * Release **0.41_0** is out of order, but given I couldn't find evidence of that (or an alternate release, such as 0.44_0?) on backpan either, I just marked the date as `unknown`. Looks like this was the first release you worked on when taking over, so maybe it was never released, or does backpan not archive dev releases? (Just checked, it does).

Cheers,
Neil