⬆️ Bumpb Werkzeug from 0.15.3 to 0.15.5

bug fixed in 0.15.4 where message is returned when running `flask db migrate`: `TypeError: required field "type_ignores" missing from Module`. bumping to later 0.15 version resolves this issue. Note that the most recent version of wz is 3.x

requirements.txt

@@ -12,7 +12,7 @@ MarkupSafe==0.23
 python-editor==1.0.3
 six==1.11.0
 SQLAlchemy==1.1.15
-Werkzeug==0.15.3
+Werkzeug==0.15.5
 base32-crockford==0.3.0
 gunicorn==19.7.1
 flask-marshmallow==0.8.0