Docs for zero vs one

[wbyoung]

Thanks for the great plugin — everything's working well so far.

One question — what do the 0 & 1 values mean in the mappings? Did I just miss something in the docs?

[ptzz]

From the code:

  " Dictionary of text objects that are supported by default. Note that some of
  " the text objects are not available in vanilla vim. '1' indicates that the
  " text object is recursive (think of nested parens or brackets)

[hexacera]

It will be good if this can actually be added to readme so people don't have to read the code or find the vim help page.