memoistを1.16にアップデートすると起動しなくなります.
memoistを1.15に戻したところ正常に稼働しました.

どうもmemoistにはそれを直すコミット
https://github.com/matthewrudy/memoist/commit/d3052454e14f6461f26b7a02153e4daa7d525b60
が入っているみたいですが,mikutterはextend Memoistしていないためその恩恵を受けることが出来ません.

これがmemoistの仕様なのかバグなのか今一つわからないため,とりあえずmikutterが動かなくなるという情報を上げさせていただきました.

エラー内容

% mikutter 
/usr/lib64/ruby/gems/2.3.0/gems/memoist-0.16.0/lib/memoist.rb:142:in `block (2 levels) in memoize': undefined local variable or method `memoized_methods' for ConfigLoader:Module (NameError)
Did you mean?  unmemoized_method
    from /usr/lib64/ruby/gems/2.3.0/gems/memoist-0.16.0/lib/memoist.rb:56:in `class_eval'
    from /usr/lib64/ruby/gems/2.3.0/gems/memoist-0.16.0/lib/memoist.rb:56:in `memoist_eval'
    from /usr/lib64/ruby/gems/2.3.0/gems/memoist-0.16.0/lib/memoist.rb:132:in `block in memoize'
    from /usr/lib64/ruby/gems/2.3.0/gems/memoist-0.16.0/lib/memoist.rb:128:in `each'
    from /usr/lib64/ruby/gems/2.3.0/gems/memoist-0.16.0/lib/memoist.rb:128:in `memoize'
    from /usr/share/mikutter/core/configloader.rb:116:in `<module:ConfigLoader>'
    from /usr/share/mikutter/core/configloader.rb:20:in `<top (required)>'
    from /usr/lib64/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /usr/lib64/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /usr/share/mikutter/core/miquire.rb:98:in `miquire_original_require'
    from /usr/share/mikutter/core/miquire.rb:95:in `file_or_directory_require'
    from /usr/share/mikutter/core/miquire.rb:76:in `block in miquire'
    from /usr/share/mikutter/core/miquire.rb:75:in `each'
    from /usr/share/mikutter/core/miquire.rb:75:in `miquire'
    from /usr/share/mikutter/core/miquire.rb:18:in `miquire'
    from /usr/share/mikutter/core/service.rb:5:in `<top (required)>'
    from /usr/lib64/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /usr/lib64/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /usr/share/mikutter/core/miquire.rb:98:in `miquire_original_require'
    from /usr/share/mikutter/core/miquire.rb:95:in `file_or_directory_require'
    from /usr/share/mikutter/core/miquire.rb:76:in `block in miquire'
    from /usr/share/mikutter/core/miquire.rb:75:in `each'
    from /usr/share/mikutter/core/miquire.rb:75:in `miquire'
    from /usr/share/mikutter/core/miquire.rb:18:in `miquire'
    from /usr/share/mikutter/mikutter.rb:38:in `<main>'