rename blockshape to chunks in readme
rename blockshape to chunks in readme

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