CI: Re-add h5py to Py38 tests

Author: effigies

.travis.yml

@@ -23,14 +23,11 @@ env:
 python:
     - 3.6
     - 3.7
+    - 3.8
 
 matrix:
   include:
     # Basic dependencies only
-    - python: 3.8
-      env:
-        - DEPENDS="numpy scipy matplotlib~=3.2.0rc1 pillow pydicom indexed_gzip"
-    # Basic dependencies only
     - python: 3.5
       env:
         - DEPENDS="-r requirements.txt"