bump version to 0.7.0
bump version to 0.7.0

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