v2.2.2

[NastyBoget]

• Added images extraction to ArticleReader.
• Added attachments and references to them in the HTML output representation (return_format="html").
• Fixed functionality of parameter need_content_analysis.
• Fixed CSVReader (exclude BOM character from the output).
• Added handling files with wrong extension or without extension to DedocManager (detect file type by its content).
• Update README.md.

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This discussion was created from the release v2.2.2.