Update README.md

Just a clear pointer to the more complete docs.
Merge pull request #222 from ruli/patch-1

Update README.md
Added suggest user api methods
suggested user tests now work with what ever user you supply, by first getting a category to search for
Merge pull request #230 from oracal/master

Added suggested users api methods
Release 1.13
Use Twitter v1.1 and use secure by default.
Fix list add/remove members for v1.1.
Fix blocks for v1.1.

Removed exists_block which is no longer an API endpoint.
Fix create/destory favorites for v1.1.
Remove notifications. API endpoints removed by Twitter.
Fix create/update/destroy lists for v1.1.
Remove friends_timeline. Gone in v1.1.
Fix friends, followers, and favorites.
Remove deprecated nearby_places.
mentions -> mentions_timeline
Remove deprecated endpoints.
Fix bug when parsing Lists.
More fixes for supporting v1.1 endpoints.
Fix tests for API changes.