Scheduled weekly dependency update for week 48 (#200)

* Update pytest from 3.10.1 to 4.0.1

* Update coverage from 4.5.1 to 4.5.2

* Update hiredis from 0.2.0 to 0.3.0

* Update cryptography from 2.4.1 to 2.4.2

* Update pyjwt from 1.6.4 to 1.7.0

requirements-dev.txt

@@ -1,18 +1,18 @@
 -e .
 flake8==3.6.0
 async-timeout==3.0.1
-pytest==3.10.1
+pytest==4.0.1
 pytest-cov==2.6.0
 pytest-mock==1.10.0
-coverage==4.5.1
+coverage==4.5.2
 sphinx==1.8.2
 pep257==0.7.0
 aiohttp-session==2.7.0
 aiopg[sa]==0.15.0
 aioredis==1.2.0
-hiredis==0.2.0
+hiredis==0.3.0
 passlib==1.7.1
-cryptography==2.4.1
+cryptography==2.4.2
 aiohttp==3.4.4
 pytest-aiohttp==0.3.0
-pyjwt==1.6.4
+pyjwt==1.7.0