Scheduled monthly dependency update for June (#186)

* Update sphinx from 1.7.4 to 1.7.5

* Update attrs from 17.4.0 to 18.1.0

* Update pycodestyle from 2.3.1 to 2.4.0

* Update pyflakes from 1.6.0 to 2.0.0

* Update pytest from 3.5.1 to 3.6.0

* Update pytest-isort from 0.1.0 to 0.2.0

* Update pytest-mock from 1.9.0 to 1.10.0

* revert pycodestyle, yawwwwn

docs/requirements.txt

@@ -1,4 +1,4 @@
 docutils==0.14
 Pygments==2.2.0
-Sphinx==1.7.4
+Sphinx==1.7.5
 sphinxcontrib-websupport==1.0.1

tests/requirements.txt

@@ -1,12 +1,12 @@
-attrs==17.4.0
+attrs==18.1.0
 coverage==4.5.1
 flake8==3.5.0
 isort==4.3.4
 mypy==0.600
 pycodestyle==2.3.1
-pyflakes==1.6.0
-pytest==3.5.1
+pyflakes==2.0.0
+pytest==3.6.0
 pytest-cov==2.5.1
-pytest-isort==0.1.0
-pytest-mock==1.9.0
+pytest-isort==0.2.0
+pytest-mock==1.10.0
 pytest-sugar==0.9.1