fix rubocop warning 'Documentation'
rubocop auto-correct
fix rubocop warning 'Eval'
fix rubocop warning 'Lambda'
fix rubocop warning 'RegexpLiteral'
fix rubocop warning 'SpaceAroundOperators'
fix rubocop warning 'TrailingComma'
fix rubocop warning 'UnusedMethodArgument'
remove rubocop-todo.yml