add h5py in dependencies

Author: srmnitc

binder/environment.yml

@@ -1,13 +1,14 @@
 channels:
   - conda-forge
 dependencies:
-  - python=3.7
-  - jupyterlab=1.*
-  - nodejs=10.15
-  - notebook<5.7.5
-  - numpy=1.17
+  - python
+  - jupyterlab
+  - nodejs
+  - notebook
+  - numpy
   - matplotlib
   - lammps
   - ase
-  - ipywidgets=7.5
-  - plotly=4.11.0
+  - ipywidgets
+  - plotly
+  - h5py

requirements_dev.txt

@@ -3,5 +3,6 @@ pytest
 pytest-cov
 pytest-benchmark
 codecov
+h5py
 ipywidgets=7.5
 plotly=4.11.0

src/pyscal/trajectory.py

@@ -2,6 +2,8 @@
 import numpy as np
 from pyscal.formats.ase import convert_snap
 import pyscal.core as pc
+import h5py
+
 
 class Timeslice:
     """