Merge pull request #388 from fantix/pyup-update-quart-0.6.8-to-0.6.9

Update quart to 0.6.9

Author: wwwjfy

requirements_dev.txt

@@ -9,7 +9,7 @@ sanic==0.8.3
 aiohttp==3.4.4
 tornado==4.5.3
 async_generator==1.10
-quart==0.6.8;python_version>="3.6"
+quart==0.6.9;python_version>="3.6"
 
 # tests
 coverage==4.5.1  # pyup: update minor