Update flask to 0.12

[pyup-bot]

There's a new version of Flask available.
You are currently using 0.10.1. I have updated it to 0.12

These links might come in handy: PyPI | Changelog | Repo

Changelog

0.12

---

Released on December 21st 2016, codename Punsch.

• the cli command now responds to --version.
• Mimetype guessing and ETag generation for file-like objects in send_file
  has been removed, as per issue 104. See pull request 1849.
• Mimetype guessing in send_file now fails loudly and doesn't fall back to
  application/octet-stream. See pull request 1988.
• Make flask.safe_join able to join multiple paths like os.path.join
  (pull request 1730).
• Revert a behavior change that made the dev server crash instead of returning
  a Internal Server Error (pull request 2006).
• Correctly invoke response handlers for both regular request dispatching as
  well as error handlers.
• Disable logger propagation by default for the app logger.
• Add support for range requests in send_file.
• app.test_client includes preset default environment, which can now be
  directly set, instead of per client.get.

0.11.2

---

Bugfix release, unreleased

• Fix crash when running under PyPy3, see pull request 1814.

0.11.1

---

Bugfix release, released on June 7th 2016.

• Fixed a bug that prevented FLASK_APP=foobar/__init__.py from working. See
  pull request 1872.

0.11

---

Released on May 29th 2016, codename Absinthe.

• Added support to serializing top-level arrays to :func:flask.jsonify. This
  introduces a security risk in ancient browsers. See
  :ref:json-security for details.
• Added before_render_template signal.
• Added **kwargs to :meth:flask.Test.test_client to support passing
  additional keyword arguments to the constructor of
  :attr:flask.Flask.test_client_class.
• Added SESSION_REFRESH_EACH_REQUEST config key that controls the
  set-cookie behavior. If set to True a permanent session will be
  refreshed each request and get their lifetime extended, if set to
  False it will only be modified if the session actually modifies.
  Non permanent sessions are not affected by this and will always
  expire if the browser window closes.
• Made Flask support custom JSON mimetypes for incoming data.
• Added support for returning tuples in the form (response, headers)
  from a view function.
• Added :meth:flask.Config.from_json.
• Added :attr:flask.Flask.config_class.
• Added :meth:flask.Config.get_namespace.
• Templates are no longer automatically reloaded outside of debug mode. This
  can be configured with the new TEMPLATES_AUTO_RELOAD config key.
• Added a workaround for a limitation in Python 3.3's namespace loader.
• Added support for explicit root paths when using Python 3.3's namespace
  packages.
• Added :command:flask and the flask.cli module to start the local
  debug server through the click CLI system. This is recommended over the old
  flask.run() method as it works faster and more reliable due to a
  different design and also replaces Flask-Script.
• Error handlers that match specific classes are now checked first,
  thereby allowing catching exceptions that are subclasses of HTTP
  exceptions (in werkzeug.exceptions). This makes it possible
  for an extension author to create exceptions that will by default
  result in the HTTP error of their choosing, but may be caught with
  a custom error handler if desired.
• Added :meth:flask.Config.from_mapping.
• Flask will now log by default even if debug is disabled. The log format is
  now hardcoded but the default log handling can be disabled through the
  LOGGER_HANDLER_POLICY configuration key.
• Removed deprecated module functionality.
• Added the EXPLAIN_TEMPLATE_LOADING config flag which when enabled will
  instruct Flask to explain how it locates templates. This should help
  users debug when the wrong templates are loaded.
• Enforce blueprint handling in the order they were registered for template
  loading.
• Ported test suite to py.test.
• Deprecated request.json in favour of request.get_json().
• Add "pretty" and "compressed" separators definitions in jsonify() method.
  Reduces JSON response size when JSONIFY_PRETTYPRINT_REGULAR=False by removing
  unnecessary white space included by default after separators.
• JSON responses are now terminated with a newline character, because it is a
  convention that UNIX text files end with a newline and some clients don't
  deal well when this newline is missing. See
  Add JSONIFY_END_WITH_NEWLINE config variable pallets/flask#1262 -- this came up originally as a
  part of https://github.com/kennethreitz/httpbin/issues/168
• The automatically provided OPTIONS method is now correctly disabled if
  the user registered an overriding rule with the lowercase-version
  options (issue 1288).
• flask.json.jsonify now supports the datetime.date type (pull request
  1326).
• Don't leak exception info of already catched exceptions to context teardown
  handlers (pull request 1393).
• Allow custom Jinja environment subclasses (pull request 1422).
• flask.g now has pop() and setdefault methods.
• Turn on autoescape for flask.templating.render_template_string by default
  (pull request 1515).
• flask.ext is now deprecated (pull request 1484).
• send_from_directory now raises BadRequest if the filename is invalid on
  the server OS (pull request 1763).
• Added the JSONIFY_MIMETYPE configuration variable (pull request 1728).
• Exceptions during teardown handling will no longer leave bad application
  contexts lingering around.

0.10.2

---

(bugfix release, release date to be announced)

• Fixed broken test_appcontext_signals() test case.
• Raise an :exc:AttributeError in :func:flask.helpers.find_package with a
  useful message explaining why it is raised when a PEP 302 import hook is used
  without an is_package() method.
• Fixed an issue causing exceptions raised before entering a request or app
  context to be passed to teardown handlers.
• Fixed an issue with query parameters getting removed from requests in
  the test client when absolute URLs were requested.
• Made before_first_request into a decorator as intended.
• Fixed an etags bug when sending a file streams with a name.
• Fixed send_from_directory not expanding to the application root path
  correctly.
• Changed logic of before first request handlers to flip the flag after
  invoking. This will allow some uses that are potentially dangerous but
  should probably be permitted.
• Fixed Python 3 bug when a handler from app.url_build_error_handlers
  reraises the BuildError.

Got merge conflicts? Close this PR and delete the branch. I'll create a new PR for you.

Happy merging! 🤖