Adds refresh API endpoint.

README.md

@@ -15,22 +15,25 @@ An API exists on TwitchTokenGenerator allowing the creation of tokens and implem
  - Create Endpoint: `https://twitchtokengenerator.com/api/create`
  - Required Rarameters:
 
-  -- base64 encoded application title
+ - - base64 encoded application title
 
-  -- scope list with + delimiter
+ - - scope list with + delimiter
 
  - Example create: `https://twitchtokengenerator.com/api/create/QXV0aEZsb3dFeGFtcGxlIFRlc3QgQXBwbGljYXRpb24=/chat_login+user_read`
 2. Response will be a json object including success bool, an id, and a message string containing the auth url. Present the URL to the program user.
 3. Your application should ping the status endpoint for updates on authorization.  The status will return error 3 "Not authorized yet" until the user authorizes their account. After authorization, the status endpoint will return their credentials on the first ping post-authorization. Additional pings will return error 4 "API instance has already expired". This is to protect the user.
  - Status endpoint: `https://twitchtokengenerator.com/api/status`
  - Required Parameters:
 
- -- Id of auth flow
- 
+ - - Id of auth flow
+
  - Example status: `https://twitchtokengenerator.com/api/status/rtotgzqct6ro6nwlwr04`
+ - Please record your access token as well as the refresh token for usage.
+4. Occasionally you will find that your Twitch access token has expired. This is new as of Twitch's oAuth2 implementation. To refresh, use the "refresh" token that you received in step 3 and hit the /api/refresh/ endpoint to get a new token.
+ - Example refresh: `https://twitchtokengenerator.com/api/refresh/{refresh_token}`
 ### Credits
  - Xxplosions' twitchtv-oauth: [Xxplosions/twitchtv-oauth](https://github.com/Xxplosions/twitchtv-oauth)
  - MobileDetect: [http://mobiledetect.net/](http://mobiledetect.net/)
 
 ### License
-MIT License. © 2017 Cole
+MIT License. © 2017 Cole