subtract just a little in child_max
subtract just a little in child_max

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