Bump aiohttp from 3.5.4 to 3.6.0 (#271)

dependabot-preview[bot] · web-flow · commit 539e351a8953 · 2019-09-09T06:08:41.000Z
diff --git a/requirements.txt b/requirements.txt
@@ -1,5 +1,5 @@
 cherry_picker==1.3.2
-aiohttp==3.5.4
+aiohttp==3.6.0
 gidgethub==3.1.0
 cachetools==3.1.1
 redis==3.3.8
