Fix pytest version to 3.10.0 in requirements to avoid celery/pytest crash.

nomad/dependencies.py

@@ -220,7 +220,7 @@ dependencies = [
     PythonGit(
         name='parsers/bigdft',
         git_url='https://gitlab.mpcdf.mpg.de/nomad-lab/parser-big-dft',
-        git_branch='nomad-fair'),
+        git_branch='nomad-fair')
 ]
 
 

requirements-dev.txt

@@ -6,7 +6,7 @@ pylint_plugin_utils
 astroid==2.0.4  # bug in pylint_mongoengine with latest version
 pylint_mongoengine
 pycodestyle
-pytest
+pytest==3.10.0
 pytest-timeout
 pytest-cov
 rope