gitattributes: default to LF
gitattributes: default to LF

1. Default to LF line endings. Windows users should use a real text editor when
   coding.
2. Allow markdown/license files to be autoconverted so they're readable
   everywhere.

fixes #6195

License: MIT
Signed-off-by: Steven Allen <4068f0880b399410602d694b3cc711c8a8f4727e@stebalien.com>

Luzifer/go-ipfs,Luzifer/go-ipfs,Luzifer/go-ipfs