Add from_str impl for gff. (#386)
Add from_str impl for gff. (#386)

* Add from_str impl for gff.

* Better error message for bad value.

* quote the src_str in the error message

Co-authored-by: David Laehnemann <0c7948b6e77e16a7c2f08e676c85de2b1aa6fa69@hhu.de>
rust-bio/rust-bio