Add encoding to utf-8 for fetch_info_lines, for fetch_head_info;

[f100024]

Fix encoding error:

UnicodeEncodeError: 'charmap' codec can't encode characters in position 39230-39231: character maps to <undefined>

[Byron]

Thanks a lot for the fix.

In theory the encoding of fetch_info_lines is undefined, so it's strange that converting them into a str() works as this requires a known encoding. Especially for printing I think it's sufficient to encode with replacement instead of failure in case of encoding errors.