Injection of spaces at start of lines in bagit-info.txt violates spec

[gordonleacock]

The bagit spec at https://tools.ietf.org/html/draft-kunze-bagit-17#section-2.2.2 says
"The label MUST NOT contain colon (:), line feeds (LF) or carriage
returns (CR). The label MAY contain linear whitespace characters,
but MUST NOT start or end with whitespace.
It is RECOMMENDED that lines not exceed 79 characters in length.
Long values MAY be continued onto the next line by inserting a line
feed (LF), a carriage return (CR), or carriage return plus line feed
(CRLF) and indenting the next line with one or more linear white
space (spaces or tabs). Except for linebreaks such padding does not
form part of the value."

This gem however add two space at the start of the label when the line exceed 79 characters in length. The result is that spec-compliant sites like APTrust.org toss any such lines when ingesting the bag.