dbc parsers cannot handle with Windows line ending

[btaczala]

If dbc file has windows line ending parser fails.
Example: https://github.com/commaai/opendbc/blob/master/tesla_can.dbc#L101

This is a part of #16

[btaczala]

This was not about Windows file ending, but a line ending with additional spaces

[btaczala]

This is fixed in #18