Bump werkzeug from 0.8.3 to 0.15.3

dependabot[bot] · web-flow · commit c30f4e6e4933 · 2019-08-21T17:08:15.000Z
Bumps [werkzeug](https://github.com/pallets/werkzeug) from 0.8.3 to 0.15.3. - [Release notes](https://github.com/pallets/werkzeug/releases) - [Changelog](https://github.com/pallets/werkzeug/blob/master/CHANGES.rst) - [Commits](pallets/werkzeug@0.8.3...0.15.3) Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/requirements.txt b/requirements.txt
@@ -1,5 +1,5 @@
 Flask==0.9
 Jinja2==2.6
-Werkzeug==0.8.3
+Werkzeug==0.15.3
 argparse==1.2.1
 wsgiref==0.1.2
