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remove old badges

jakirkham/dask,ContinuumIO/dask,gameduell/dask,dask/dask,blaze/dask,blaze/dask,mrocklin/dask,dask/dask,mraspaud/dask,ContinuumIO/dask,cpcloud/dask,mraspaud/dask,jakirkham/dask,chrisbarber/dask,jcrist/dask,mrocklin/dask,jcrist/dask