add hdf h5py package to dependencies

.github/workflows/testing.yml

@@ -19,7 +19,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install --user pytest-cov numpy matplotlib scipy argparse
+        pip install --user pytest-cov numpy matplotlib scipy argparse h5py
 ##    - name: flake
 ##       run: |
 ##         # stop the build if there are Python syntax errors or undefined names