Bump flask from 1.0.3 to 1.1.0

Bumps [flask](https://github.com/pallets/flask) from 1.0.3 to 1.1.0.
- [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/1.0.3...1.1.0)

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

setup.py

@@ -32,7 +32,7 @@ setup(
     keywords='gliding ogn',
     packages=find_packages(exclude=['tests', 'tests.*']),
     install_requires=[
-        'Flask==1.0.3',
+        'Flask==1.1.0',
         'flask-sqlalchemy==2.4.0',
         'Flask-Migrate==2.5.2',
         'flask-bootstrap==3.3.7.1',