Update setup.py

Author: ferrine

setup.py

@@ -82,6 +82,8 @@ def get_version():
         python_requires=">=3.8",
         install_requires=install_reqs,
         extras_requires=dict(
-            dask=["dask[all]"], histogram=["xhistogram"], all=["dask[all]", "xhistogram"]
+            dask_histogram=["dask[all]", "xhistogram"],
+            histogram=["xhistogram"],
+            all=["dask[all]", "xhistogram"],
         ),
     )