revert h5py version limitation

Author: vera121

python/requirements.txt

@@ -4,7 +4,7 @@ scipy
 scikit-image==0.14.4
 matplotlib>=1.3.1
 ipython>=3.0.0
-h5py==2.10.0
+h5py>=2.2.0
 leveldb==0.20
 networkx==2.2
 nose>=1.3.0