Scheduled weekly dependency update for week 12 (#216)

* Update sphinx from 1.7.1 to 1.7.2

* Update mypy from 0.570 to 0.580

* Update pytest from 3.4.2 to 3.5.0

Author: pyup.io bot

requirements/ci.txt

@@ -2,11 +2,11 @@
 flake8==3.5.0
 pyflakes>=1.0.0
 coverage==4.5.1
-sphinx==1.7.1
+sphinx==1.7.2
 alabaster>=0.6.2
 pytest-cov==2.5.1
 pygments==2.2.0
-mypy==0.570; platform_python_implementation != "PyPy"
+mypy==0.580; platform_python_implementation != "PyPy"
 -e .
 
 codecov==2.0.15

requirements/wheel.txt

@@ -1,3 +1,3 @@
 cython==0.28.1
-pytest==3.4.2
+pytest==3.5.0