Bump flask-cors from 3.0.3 to 3.0.9

Bumps [flask-cors](https://github.com/corydolphin/flask-cors) from 3.0.3 to 3.0.9.
- [Release notes](https://github.com/corydolphin/flask-cors/releases)
- [Changelog](https://github.com/corydolphin/flask-cors/blob/master/CHANGELOG.md)
- [Commits](corydolphin/flask-cors@3.0.3...3.0.9)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements.txt

@@ -1,5 +1,5 @@
 Flask==0.12.2
-Flask-Cors==3.0.3
+Flask-Cors==3.0.9
 gunicorn==19.7.1
 pylint==1.8.2
 pymongo==3.3.1