Bump flask from 0.10.1 to 1.0

Bumps [flask](https://github.com/pallets/flask) from 0.10.1 to 1.0.
- [Release notes](https://github.com/pallets/flask/releases)
- [Changelog](https://github.com/pallets/flask/blob/master/CHANGES.rst)
- [Commits](pallets/flask@0.10.1...1.0)

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -1,5 +1,5 @@
 Babel==1.3
-Flask==0.10.1
+Flask==1.0
 Flask-Babel==0.9
 Flask-Cache==0.13.1
 Flask-Login==0.2.11