v1.0.0 - switch file version 3 to default

[yoshi389111]

The file format default has been switched to version 3.
To generate file format versions 1 and 2, you must explicitly use the -F 1 or -F 2 option.
Decryption will automatically detect the format version.

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This discussion was created from the release v1.0.0 - switch file version 3 to default.