Limit number of days in WporgClient::getPluginDownloads to 730

[engelen]

The WordPress API will use the default limit (180 days) if the limit passed to in the API call exceeds 731. The getPluginDownloads method of WporgClient should probably attend to this by limiting the number of days to 730 and mentioning it in the method's block-documentation.

[Rarst]

Is this documented something (so it can be linked to) or just empirically determined?

[engelen]

It's not documented anywhere as far as I know, but I've determined it empirically with quite some certainty, and the fact that it's 2*365 adds to my suspicion that it is no coincidence :-). Anyway, saw the commit, nice.