Bump werkzeug from 0.14.1 to 0.15.3 in /app#2

dependabot[bot] wants to merge 1 commit intomainnbgallery/nbgallery-api-python:mainfrom

dependabot/pip/app/werkzeug-0.15.3nbgallery/nbgallery-api-python:dependabot/pip/app/werkzeug-0.15.3Copy head branch name to clipboard