Drf-yasg

- **IMPROVED:** updated ``swagger-ui`` to version 3.20.1
- **IMPROVED:** updated ``ReDoc`` to version 2.0.0-alpha.41
- **FIXED:** ``minLength`` and ``maxLength`` will now also work for ``ListSerializer`` in addition to ``ListField``
- **FIXED:** ``MultipleChoiceField`` will now use the ``multi`` ``collectionFormat`` where appropriate (257)
- **FIXED:** the ``format``, ``pattern``, ``enum``, ``min_length`` and ``max_length`` attributes of ``coreschema.Schema`` will now be persited into the converted ``openapi.Parameter`` (212, 233)

- **ADDED:** ``PERSIST_AUTH``, ``REFETCH_SCHEMA_WITH_AUTH``, ``REFETCH_SCHEMA_ON_LOGOUT`` settings and related javascript implementation for persisting authentication data to swagger-ui localStorage
- **IMPROVED:** UI-enabled views will now no longer generate the full specification document twice; the HTML part of the view will only generate a barebones ``Swagger`` object with no ``paths`` and ``definitions``
- **IMPROVED:** added the ``FETCH_SCHEMA_WITH_QUERY`` setting to enable fetching of the schema document using query parameters passed to the UI view (208)
- **IMPROVED:** added support for the very common ``x-nullable`` extension (217)
- **IMPROVED:** extensibility of some classes was improved by adding more extension points, together with more blocks for ``swagger-ui.html``/``redoc.html`` and some JavaScript hooks in ``swagger-ui-init.js``
- **FIXED:** removed usage of ``inspect.signature`` on python 2.7 (222)

- **ADDED:** added the ``DISPLAY_OPERATION_ID `` ``swagger-ui`` setting
- **IMPROVED:** updated ``ReDoc`` to version 2.0.0-alpha.38
- **IMPROVED:** Operation summary will now be parsed from multi-line view method docstrings (205)
- **IMPROVED:** ``pattern`` will now work on any field with a ``RegexValidator`` (would previously not appear on fields with special formats such as ``EmailField``)
- **FIXED:** fixed an issue with ``RelatedFieldInspector`` handling of nested serializers
- **FIXED:** fixed handling of ``reverse_lazy`` in URL settings (209)

- **ADDED:** added the ``SPEC_URL`` setting for controlling the download link in ``swagger-ui`` and ``ReDoc``
- **ADDED:** updated ``ReDoc`` settings (added ``NATIVE_SCROLLBARS`` and ``REQUIRED_PROPS_FIRST``)
- **ADDED:** added ``extra_styles`` and ``extra_scripts`` blocks to ui templates (178)
- **IMPROVED:** updated ``swagger-ui`` to version 3.18.2
- **IMPROVED:** updated ``ReDoc`` to version 2.0.0-alpha.37
- **FIXED:** stopped generating invalid OpenAPI by improper placement of ``readOnly`` Schemas
- **FIXED:** fixed broken CSS when ``USE_SESSION_AUTH=False``
- **FIXED:** fixed implementation of ``operation_summary`` and ``deprecated`` (194, 198)
- **FIXED:** fixed a bug related to nested ``typing`` hints (195)
- **FIXED:** removed dependency on ``future`` (196)
- **FIXED:** removed exceptions loged for fields with ``default=None`` (203)
- **FIXED:** fixed ``request_body=no_body`` handling and related tests (188, 199)

- **ADDED:** added ``EXCLUDED_MEDIA_TYPES`` setting for controlling ``produces`` MIME type filtering (158)
- **ADDED:** added support for ``SerializerMethodField``, via the ``swagger_serializer_method`` decorator for the method field, and support for Python 3.5 style type hinting of the method field return type (137, 175, 179)
*NOTE:* in order for this to work, you will have to add the new ``drf_yasg.inspectors.SerializerMethodFieldInspector`` to your ``DEFAULT_FIELD_INSPECTORS`` array if you changed it from the default value
- **IMPROVED:** updated ``swagger-ui`` to version 3.18.0
- **IMPROVED:** added support for Python 3.7 and Django 2.1 (176)
- **IMPROVED:** ``swagger_schema_fields`` will now also work on serializer ``Field``s (167)
- **IMPROVED:** ``ref_name`` collisions will now log a warning message (156)
- **IMPROVED:** added ``operation_summary`` and ``deprecated`` arguments to ``swagger_auto_schema`` (149, 173)
- **FIXED:** made ``swagger_auto_schema`` work with DRF 3.9 ``action`` mappings (177)

- **IMPROVED:** updated ``swagger-ui`` to version 3.17.6
- **IMPROVED:** updated ``ReDoc`` to version 2.0.0-alpha.32
- **IMPROVED:** added ``--api-version`` argument to the ``generate_swagger`` management command (170)
- **FIXED:** corrected various documentation typos (160, 162, 171, 172)
- **FIXED:** made ``generate_swagger`` work for projects without authentication (161)
- **FIXED:** fixed ``SafeText`` interaction with YAML codec (159)