Bump flask from 0.10.1 to 1.0 (#133)

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](https://github.com/pallets/flask/compare/0.10.1...1.0)

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

pip_requirements.txt

@@ -1,4 +1,4 @@
-Flask==0.10.1
+Flask==1.0
 Flask-Babel==0.9
 Jinja2==2.7.2
 Werkzeug==0.9.4