bump version to 0.2.1
bump version to 0.2.1

esc/dask,PeterDSteinberg/dask,jakirkham/dask,vikhyat/dask,cpcloud/dask,mraspaud/dask,minrk/dask,clarkfitzg/dask,marianotepper/dask,vikhyat/dask,jayhetee/dask,PhE/dask,simudream/dask,dask/dask,blaze/dask,hainm/dask,mraspaud/dask,simudream/dask,jayhetee/dask,jakirkham/dask,jcrist/dask,minrk/dask,marianotepper/dask,ssanderson/dask,hainm/dask,gameduell/dask,ContinuumIO/dask,freeman-lab/dask,cowlicks/dask,mrocklin/dask,blaze/dask,mikegraham/dask,PhE/dask,mrocklin/dask,wiso/dask,pombredanne/dask,wiso/dask,freeman-lab/dask,ssanderson/dask,esc/dask,clarkfitzg/dask,dask/dask,chrisbarber/dask,jcrist/dask,pombredanne/dask,ContinuumIO/dask