Log Message:
py-werkzeug: updated to 0.15.4

Version 0.15.4
-   Fix a SyntaxError on Python 2.7.5. (:issue:1544)

Version 0.15.3
-   Properly handle multi-line header folding in development server in
    Python 2.7. (:issue:1080)
-   Restore the response argument to :exc:~exceptions.Unauthorized.
    (:pr:1527)
-   :exc:~exceptions.Unauthorized doesn't add the WWW-Authenticate
    header if www_authenticate is not given. (:issue:1516)
-   The default URL converter correctly encodes bytes to string rather
    than representing them with b''. (:issue:1502)
-   Fix the filename format string in
    :class:~middleware.profiler.ProfilerMiddleware to correctly handle
    float values. (:issue:1511)
-   Update :class:~middleware.lint.LintMiddleware to work on Python 3.
    (:issue:1510)
-   The debugger detects cycles in chained exceptions and does not time
    out in that case. (:issue:1536)
-   When running the development server in Docker, the debugger security
    pin is now unique per container.