2.0.0

CHANGES:

• Bump lower-bound on Cstruct to 6.0.0 (@MisterDA, @djs55, @dinosaure, #74)
• Update to Dune 2.9 and generate opam files (@MisterDA, @djs55, @dinosaure, #74)
• Support only OCaml versions 4.08 and higher. (@MisterDA, @dinosaure, #77)
• Don't print any logging to stdout or stderr (@MisterDA, @djs55, @dinosaure, #74)
• Remove Tar.Make.Header, Tar_cstruct.Header, Tar_unix.Header, and
  Tar_lwt_unix.Header to keep only Tar.Header and use it everywhere.
  • Tar.Make.Header.get_next_header becomes Tar.Make.get_next_header;
  • Tar_cstruct.Header.get_next_header becomes Tar_cstruct.get_next_header;
  • Tar_lwt_unix.Header.get_next_header becomes Tar_lwt_unix.get_next_header;
  • Tar_lwt_unix.Header.of_file becomes Tar_lwt_unix.header_of_file;
  • Tar_unix.Header.get_next_header becomes Tar_unix.get_next_header;
  • Tar_unix.Header.of_file becomes Tar_unix.header_of_file;
  • All the Tar_*.Header.t values have to be changed to Tar.Header.t.
    (@MisterDA, @dinosaure, #77)
• Fix parsing of pax Extended Header File Times with sub-second
  granularity. (@MisterDA, @dinosaure, #77)
• Add Tar_unix.transform and Tar_lwt_unix.transform to help
  transforming headers of a streamed tar archive between two file
  descriptors. (@MisterDA, @dinosaure, #77)
• Remove {build} tag on the dune dependency (@craigfe, @hannesm, #72)
• Adapt ocaml-tar to newer MirageOS interfaces (@hannesm, @dinosaure, #73)
• Update gnu.org link (@reynir, @dinosaure, #79)
• file_mode defaults to 0o400 (@reynir, @MisterDA, @dinosaure, #78)