Bump flask from 0.12.2 to 1.0

Bumps [flask](https://github.com/pallets/flask) from 0.12.2 to 1.0.
- [Release notes](https://github.com/pallets/flask/releases)
- [Changelog](https://github.com/pallets/flask/blob/master/CHANGES.rst)
- [Commits](pallets/flask@0.12.2...1.0)

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

Author: dependabot[bot]

requirements.txt

@@ -10,7 +10,7 @@ click==6.7
 delegator.py==0.0.13
 docutils==0.13.1
 durationpy==0.4
-Flask==0.12.2
+Flask==1.0
 Flask-Cors==3.0.3
 future==0.16.0
 futures==3.1.1