bump version to 1.1.5
bump version to 1.1.5

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