hamming: move inputs (strand1, strand2) to input object
hamming: move inputs (strand1, strand2) to input object

hamming 2.1.0

As proposed and accepted in https://github.com/exercism/problem-specifications/issues/996

```ruby
indent = false

ARGF.each_line { |l|
  if l.include?('version')
    ver = l.split(?")[3]
    ver_components = ver.split(?.).map(&:to_i)
    ver_components[1] += 1
    ver_components[2] = 0
    l[ver] = ver_components.join(?.)
  end

  first_non_space = l.index(?")
  if l.include?('strand1')
    puts ' ' * first_non_space + '"input": {'
    indent = true
  end
  l.delete!(?,) if l.include?('strand2')
  puts "#{'  ' if indent}#{l}"
  if l.include?('strand2')
    puts ' ' * first_non_space + '},'
    indent = false
  end
}
```

exercism/x-common,rpottsoh/x-common,rpottsoh/x-common,ErikSchierboom/x-common,petertseng/x-common,jmluy/x-common,jmluy/x-common,jmluy/x-common,petertseng/x-common,ErikSchierboom/x-common,exercism/x-common