Remove requirement to modify changelog (#4915)
Remove requirement to modify changelog (#4915)

In practice the release manager copy-pastes the git commit titles
dask/dask,mrocklin/dask,jakirkham/dask,dask/dask,blaze/dask,jakirkham/dask,ContinuumIO/dask,ContinuumIO/dask,mrocklin/dask,blaze/dask