1.0.2

Bug fixes for file uploading!

Also:

• Improved docs
• Added some py3 fixes

1.0.0

• the api_call function now returns a decoded JSON object, rather than a JSON encoded string
• some api_call calls now call actions on the parent server object:
  • im.open
  • mpim.open, groups.create, groups.createChild
  • channels.create, channels.join