Fix dependency on hdf5plugin

This commit also removes numcodecs from the CI environment.

.gitlab-ci.yml

@@ -5,8 +5,6 @@ test:
     before_script:
         - pip install pytest
         - pip install pytest-mock
-        - pip install hdf5plugin
-        - pip install numcodecs
         - pip install --trusted-host nims.desy.de
           --find-links=http://nims.desy.de/extra/asapo/linux_wheels
           asapo_producer==20.12.0 asapo_consumer==20.12.0

setup.py

@@ -17,7 +17,7 @@ VERSION = '0.0.3'
 # What packages are required for this module to be executed?
 REQUIRED = [
     'attrs', 'numpy', 'asapo_consumer', 'asapo_producer', 'scikit-image',
-    'h5py'
+    'h5py', 'hdf5plugin'
 ]
 
 # What packages are optional?