add numpydoc to requirements-docs
add numpydoc to requirements-docs

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