add .github/PULL_REQUEST_TEMPLATE.md file
add .github/PULL_REQUEST_TEMPLATE.md file

ContinuumIO/dask,blaze/dask,dask/dask,blaze/dask,jcrist/dask,jakirkham/dask,dask/dask,mrocklin/dask,jakirkham/dask,mrocklin/dask,ContinuumIO/dask,jcrist/dask