Scheduled weekly dependency update for week 31 (#3176)

* Update async-generator from 1.9 to 1.10

* Update cython from 0.28.4 to 0.28.5

* Update cython from 0.28.4 to 0.28.5

* Update pytest from 3.6.4 to 3.7.1

* Update pytest from 3.6.4 to 3.7.1

* Update tox from 3.1.2 to 3.1.3

* Update uvloop from 0.11.0 to 0.11.1

requirements/ci-wheel.txt

@@ -1,27 +1,27 @@
 attrs==18.1.0
-async-generator==1.9
+async-generator==1.10
 async-timeout==3.0.0
 brotlipy==0.7.0
 cchardet==2.1.1
 chardet==3.0.4
 coverage==4.5.1
-cython==0.28.4
+cython==0.28.5
 flake8==3.5.0
 gunicorn==19.8.1
 isort==4.3.4
 pyflakes==2.0.0
 multidict==4.3.1
-pytest==3.6.4
+pytest==3.7.1
 pytest-cov==2.5.1
 pytest-mock==1.10.0
 pytest-xdist==1.22.5
 towncrier==18.6.0
-tox==3.1.2
+tox==3.1.3
 twine==1.11.0
 yarl==1.2.6
 
 # Using PEP 508 env markers to control dependency on runtimes:
 aiodns==1.1.1; platform_system!="Windows"  # required c-ares will not build on windows
 codecov==2.0.15; platform_system!="Windows"  # We only use it in Travis CI
-uvloop==0.11.0; platform_system!="Windows" and implementation_name=="cpython" and python_version<"3.7" # MagicStack/uvloop#14
+uvloop==0.11.1; platform_system!="Windows" and implementation_name=="cpython" and python_version<"3.7" # MagicStack/uvloop#14
 idna-ssl==1.1.0; python_version<"3.7"

requirements/wheel.txt

@@ -1,3 +1,3 @@
-cython==0.28.4
-pytest==3.6.4
+cython==0.28.5
+pytest==3.7.1
 twine==1.11.0