Update pytest-sugar from 0.8.0 to 0.9.0 (#369)

Author: pyup.io bot

requirements.txt

@@ -8,7 +8,7 @@ sphinx==1.6.3
 tox==2.7.0
 pytest==3.2.1
 pytest-cov==2.5.1
-pytest-sugar==0.8.0
+pytest-sugar==0.9.0
 pytest-timeout==1.2.0
 sphinxcontrib-asyncio==0.2.0
 sqlalchemy==1.1.13