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] <support@github.com>

Author: dependabot[bot]

setup.py

@@ -117,7 +117,7 @@
     install_requires=[
         "six",
         "aniso8601==1.2.0",
-        "Flask==0.12.2",
+        "Flask==1.0",
         "Flask-RESTful==0.3.4",
         "Jinja2==2.7.2",
         "MarkupSafe==0.23",