v2.0.2

A quick patch addressing some issues we've encountered in the past couple of days.

Changelog

c172b1e Update go-osuapi library
95a411c Make difficulty_rating a decimal with 15 dec places
1a873f2 downloader.ErrNoRedirect should be checked for earlier than it is now
baff2f9 make default sorting (in case of no query) id DESC

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