umoci 0.4.1

• The number of possible tags that are now valid with umoci subcommands has
  increased significantly due to an expansion in the specification of the
  format of the ref.name annotation. To quote the specification, the
  following is the EBNF of valid refname values. openSUSE/umoci#234

  refname   ::= component ("/" component)*
  component ::= alphanum (separator alphanum)*
  alphanum  ::= [A-Za-z0-9]+
  separator ::= [-._:@+] | "--"
  

• A new umoci insert subcommand which adds a given file to a path inside the
  container. openSUSE/umoci#237
• A new umoci raw unpack subcommand in order to allow users to unpack images
  without needing a configuration or any of the manifest generation.
  openSUSE/umoci#239
• umoci how has a logo. Thanks to Max Bailey for contributing
  this to the project. openSUSE/umoci#165 openSUSE/umoci#249

• umoci unpack now handles out-of-order regular whiteouts correctly (though
  this ordering is not recommended by the spec -- nor is it required). This is
  an extension of openSUSE/umoci#229 that was missed during review.
  openSUSE/umoci#232
• umoci unpack and umoci repack now make use of a far more optimised gzip
  compression library. In some benchmarks this has resulted in umoci repack
  speedups of up to 3x (though of course, you should do your own benchmarks).
  umoci unpack unfortunately doesn't have as significant of a performance
  improvement, due to the nature of gzip decompression (in future we may
  switch to zlib wrappers). openSUSE/umoci#225 openSUSE/umoci#233

Thanks to all of the contributors that made this release possible:

• Abhilash Raj maxking@users.noreply.github.com
• Akihiro Suda suda.akihiro@lab.ntt.co.jp
• Aleksa Sarai asarai@suse.de
• Felix Abecassis fabecassis@nvidia.com
• Max Bailey maxbailey@flywheel.io
• Tycho Andersen tycho@tycho.ws

Signed-off-by: Aleksa Sarai asarai@suse.de