Add dask dependency to setup.py

setup.py

@@ -23,6 +23,8 @@ setup(name='nnfwtbn',
                         "atlasify>=0.2.0",
                         "tensorflow",
                         "keras",
+                        "dask",
+                        "dask[dataframe]",
                         "lxml"],
       test_suite='nnfwtbn.tests',
       description='Experimental neural network framework to be named.',