Symfony 4 was released on November 30th.
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Errors for "liip-liipimagine-bundle/2.0"

cache-resolver/aws_s3.rst:136: ERROR: Unexpected indentation.

Errors for "nelmio-nelmioapidoc-bundle/master"

swagger-support.rst:85: WARNING: Title underline too short.
Integration with ``swagger-api/swagger-ui``
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swagger-support.rst:85: WARNING: Title underline too short.
Integration with ``swagger-api/swagger-ui``
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Errors for "friendsofsymfony-fosuser-bundle/master"

emails.rst:52: WARNING: Explicit markup ends without a blank line; unexpected unindent.

Errors for "symfony/2.3"

cookbook/bundles/best_practices.rst:198: WARNING: Pygments lexer name u'markdown' is not known