remove docs from gitignore

Merge pull request #48 from Joe-noh/support-player-api

Support Player API

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Update README and versions

Merge branch 'steveklebanoff-retry-after-data' into development

* steveklebanoff-retry-after-data:
  return retry-after data for when we get a 429 response
  Update version in README

Merge branch 'development'

* development:
  structuring data for playlist response
  adjusting new json response for spotify playlists

Merge branch 'development'

* development:
  Update Versions
  raise AuthenticationError if error during Oauth

Merge branch 'development'

* development:
  Update versions

Version 2.0.1

Update README