Change values of .rubocop.yml to default

- Use default `Style/IndentHash`: `special_inside_parentheses`

    This is `consistent` style:
    ``` ruby
    some_method(value, {
      one: 1,
      two: 2
    },
                another_value)
    ```

    This is `special_inside_parentheses` style:
    ``` ruby
    some_method(value, {
                  one: 1,
                  two: 2,
                },
                another_value)
    ```

    Both style passes this:
    ``` ruby
    some_method(value,
                {
                  one: 1,
                  two: 2
                },
                another_value)
    ```
- Disable `Style/MethodCalledOnDoEndBlock`

    Because this blocks every method call on do ... end block, even if it is just simple `join` or `flatten`:
    ``` ruby
    [1, 2, 3].map do |v|
      (v + 1).to_s
    end.join
    ```
    But we should still avoid chaining multi-line blocks: https://github.com/bbatsov/ruby-style-guide#single-line-blocks