Version 0.57.1

v0.57.1

• [TeamMsgExtractor #489] Fix an issue where MessageSignedBase.body would raise an error when the plain text body was not utf-8 encoded bytes. This error was due to extract_msg.utils.unwrapMultipart() accidentally returning the plain text body as bytes instead of string.
• Change some of the command line documentation.
• Fix some of the imports in extract_msg/__init__.py.
• Add additional tests to module.