Merge pull request #3407 from ThomasWaldmann/exclude-broken-pytest330

exclude broken pytest 3.3.0 release

requirements.d/development.txt

@@ -3,7 +3,7 @@ setuptools_scm
 pip
 virtualenv
 tox
-pytest
+pytest!=3.3.0
 pytest-xdist
 pytest-cov
 pytest-benchmark