Update to upstream version '0.5.4'
with Debian dir a750b918600e92d42c0ebb6ad248a375122b8390

Thanks to kwilczynski who is the upstream maintainer and helped us
identifying this.

This variable was changed by upstream, 'RB_' was removed.

  * d/patches/relax-mini-portile2-dependency.patch: Add patch.
    - Relax dependency on mini_portile2 to the version available in Debian.
  * d/patches/series: Enable new patch.

  * d/rules: Use DH_RUBY_GEM_INSTALL_INCLUDE instead of
    DH_RUBY_GEM_INSTALL_WHITELIST_APPEND (closes: #997533).

  * d/clean: Remove file. We'll use the .gemspec file.
  * d/control (Homepage): Use the github project page.
  * d/copyright: Remove all notes related to projects not being part of the
    source. Add Upstream-Contact field and github project page.
  * d/gemspec: Remove file. We'll use upstream's gemspec.
  * d/ruby-tests.rake: Add tests.
  * d/watch: Use the github sources.
  * d/upstream/metadata: Fix all fields.

  * d/patches/*: Refresh patches and add DEP-3 headers.

Update to upstream version '0.5.0'
with Debian dir 4bbc1251c8f033930d269daea72a6a5990977146

Update to upstream version '0.4.0'
with Debian dir 79a2f5dd5b828aac97e1ef6a0e4c4e605aebea57