Add link to bounty history to readme (#2642)
Add link to bounty history to readme (#2642)

Add link to bounty history to readme
EVAST9919/osu-framework,EVAST9919/osu-framework,peppy/osu-framework,smoogipooo/osu-framework,EVAST9919/osu-framework,ZLima12/osu-framework,peppy/osu-framework,ppy/osu-framework,ppy/osu-framework,ZLima12/osu-framework,smoogipooo/osu-framework,ppy/osu-framework,peppy/osu-framework,EVAST9919/osu-framework