updated readme
Merge branch 'master' of github.com:Raynos/jsonml-stringify

* 'master' of github.com:Raynos/jsonml-stringify:
  0.3.11
  0.3.10
  disable indendation for children if not use whitespace
  0.3.9
  fix renderer
  0.3.8
  improve whitespace stuff
  0.3.7
  0.3.6
  do not put whitespace in pre & textarea
  refactor docs
  fix docs
  0.3.5
  make normalize errors more friendly
  0.3.4
  throw meaningful error when invalid jsonml
0.3.12