Upgrade requirements (#526)

requirements.txt

@@ -27,17 +27,17 @@ mysqlclient==1.3.13
 parameterized==0.6.1
 pathlib2==2.3.3           # via pytest, pytest-django
 pbr==5.1.1                # via mock
-pluggy==0.8.0             # via pytest
+pluggy==0.8.1             # via pytest
 py==1.7.0                 # via pytest
 pycodestyle==2.4.0        # via flake8
 pyflakes==2.0.0           # via flake8
 pygments==2.3.1
-pytest-django==3.4.4
+pytest-django==3.4.5
 pytest-flake8dir==1.3.0
 pytest-randomly==1.2.3
 pytest-super-check==1.0.0
-pytest==4.0.2
-pytz==2018.7
+pytest==4.1.1
+pytz==2018.9
 scandir==1.9.0            # via pathlib2
 six==1.12.0               # via mariadb-dyncol, mock, more-itertools, multilint, pathlib2, pytest, pytest-flake8dir, pytest-super-check
 sqlparse==0.2.4