v2.1.0

New minor version.

Changes:

• Added new option parameter to login.login, allowing you to specify API options to be passed to facebook-chat-api at login.
  • By default, logLevel is set to error and forceLogin is set to true; previously, no options were passed, so this results in new default behavior at runtime:
    • Reduces the amount of logging from facebook-chat-api
    • Auto-approves any recent login warnings
  • To return to the old behavior, pass options = {} in your login calls.
• Some cleanup in docs, readme, and other reference material around the repo.